what is the pH of 6×10^-9
Answers
The pH of a solution with concentration of 6 × 10-⁹ is 8.22.
How to calculate pH?The pH of a solution is a measure of the degree of acidity or alkalinity of its solution.
The pH of a solution can be calculated using the following expression;
pH = - log {H}
Where;
H = hydrogen ion concentrationAccording to this question, a solution has a concentration of 6 × 10-⁹M. The pH can be calculated as follows:
pH = - log {0.000000006}
pH = 8.22
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Related Questions
pls complete the table with the correct answer
Answers
Answer:
The correct answer is :
Natural fibres: these fibers are found naturally in the environment such as cotton, hemp or wool, all are made naturally found fibers.
sr. no. name type
1 Cotton natural
2 Linen natural
3 Silk natural
4 Wool natural
5. Hemp natural
Artificial fibres: made from the polymerization of their monomer unit for example polyester made from coal and petroleum products.
sr. no. name type
1 Polyester artificial
2 Rayon artificial
3 Spandex artificial
4 Acrylic artificial
5. microfibers artificial
what quantity in moles of iron atoms do you have if you have 2.50 × 10²³ atoms of iron. (the mass of one mole of iron is 55.85 g.) quizlet
Answers
There are 4.48 x 10² moles of iron atoms present in 2.50 x 10²³ atoms.
In order to answer this question, we must first determine how many moles of iron atoms are present in 2.50 x 10²³ atoms. To do this, we need the atomic mass of iron which is 55.85 g. This means that one mole of iron has a mass of 55.85 g.
Therefore, in order to determine the number of moles present in 2.50 x 10²³ atoms, we must divide the mass of 2.50 x 10²³ atoms by 55.85 g, which gives us a result of 4.48 x 10² moles of iron atoms. So, the answer to the question is that there are 4.48 x 10² moles of iron atoms present in 2.50 x 10²³ atoms.
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which statement best describes what a spectrophotometer does? question 7 options: it calculates the number of molecules in a solution. it determines the density of a solution by measuring the number of particulates present. it measures color by shining light on a solution. it measures the amount of a given wavelength of light absorbed by a sample solution. it measures the amount of a given wavelength of light generated by a sample solution.
Answers
Spectrophotometer measures the amount of light absorbed or reflected by a sample solution.
A spectrophotometer is a device used to measure the amount of light a sample solution absorbs or reflects.
It works by shining a beam of light onto a sample solution and then measuring the intensity of the light that is reflected or absorbed.
The light used is typically in the visible spectrum, such as white light, but may also include ultraviolet or infrared light, depending on the application.
The intensity of the light is usually measured in terms of percent transmission or percent reflectance.
To measure the amount of light absorbed or reflected, the sample is placed into a cuvette, a special container designed to hold samples for spectrophotometry.
The light is then shined through the cuvette and onto a detector, which measures the intensity of the light that passes through the sample.
The detector then produces a numerical reading that is directly proportional to the amount of light absorbed by the sample.
spectrophotometer measures the amount of light absorbed or reflected by a sample solution.
It does this by shining a beam of light through the sample solution and then measuring the intensity of the light that passes through it.
The intensity of the light is measured in terms of percent transmission or percent reflectance, which is then used to calculate the amount of light absorbed or reflected by the sample.
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You have three elements, A, B, and C, with the following electronegativity values:
Scoi
A = 0.9
B = 3.0
C = 3.5
You react the elements to form the substances AB, AC, and BC. Answer the following questions:
What type of substance is AB? What types of bonds are present? Explain your answer.
What type of substance is AC? What types of bonds are present? Explain your answer.
What type of substance is BC? What types of bonds are present? Explain your answer.
If any of the substances are ionic compounds, which element is the cation and which is the anion?
Explain your answer.
Answers
AB is an ionic Compound , BC is covalent Compound , AC is an Ionic Compound.
What is Electronegativity ?It is the tendency of an atom in which molecule is usually attract towards the shared pair of electrons which generally is known as electronegativity. As we move across a period i.e from left to right. Here the nuclear charge increases and the atomic size decreases, hence the value of electronegativity increases across a period according to the modern periodic table.Atomic number increases as we move down the group.The nuclear charge also increases but it's effect increase in nuclear charge is overcome with the help of addition of one shell. the value of electronegativity decreases while moving down the group.Now,
A = 0.9
B = 3.0
C = 3.5
AB is an ionic compound. If the difference of electronegativity between two atoms is more than 1.7 , then they will form ionic compound. Here A is Cation and B is Anion .
Electronegativity difference between A and C = 3.5 - 0.9 = 2.6Hence AC is an ionic compound.
A is Cation and B is Anion .
Electronegativity difference between B and C = 3.5 - 3.30 = 0.5Hence BC is a covalent Compound.
Thus , from the above conclusion we can say that, AB is an ionic Compound , BC is covalent Compound , AC is an Ionic Compound.
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Consider the balanced reactionbelow:2FeBr3 + 3Na2S → Fe2S3 +6NaBrHow many moles of iron(III) sulfide,Fe2S3, would be produced from thecomplete reaction of 449 g iron(III)bromide, FeBr3?
Answers
Given :
• Molar mass of FeBr3 = 295.56 g/mol
,• Mass of FeBr3 = 449 g
(I) Calculate moles of FeBr3 \(\begin{gathered} \text{Moles = }\frac{mass\text{ }}{\text{Molecular mass }} \\ \text{ = }\frac{449\text{ g }}{295.56\text{ g/mol}} \\ \text{ =1.519 } \\ \text{ }\approx1.52molesofFeBr_3 \end{gathered}\)(II) Calculate moles of Fe2S3The balanced reaction is given as :
\(2FeBr_3+3Na_2S\text{ }\Rightarrow Fe_2S_{3\text{ }}+\text{ 6NaBr }\)by stoichiometry , we can see that :
• 2 moles of FeBr3 produces 1 moles of Fe2S3
Therefore ;
• 1.52 mol of febr3 produces X Fe2S3
,• X moles of FE2S3, = (1.52moles FeBr3 * 1 mol Fe2S3) /2 moles
FeBr3.
=0.755 moles
≈0.76 moles
• This means that 0.76 moles of Fe2S3 would be produced from the complete reaction of 449 g iron(III)bromide,
If 0.583 g of ammonia (NH3) is dissolved to make 250 mL of solution, what is the molarity?
Answers
Answer:
0.137 M NH3
Explanation:
First divide the mass of NH3 by the molar mass of NH3, and then divide by the volume to get molarity.
0.583 g / 17.031 g/mol = 0.0342 mol NH3
0.0342 mol NH3 / 0.250 L = 0.137 M NH3
A solution of hydrochloric acid is 0.050 M HCl. What is the hydronium-ion concentration at 25°C? What is the hydroxide-ion concentration at 25°C? 2×〖10〗^(−13)
Answers
The hydronium-ion concentration at 25°C is 2 x 10⁻¹³ M.
What is solution?Solution is defined as a particular kind of homogenous combination made up of two or more different ingredients. The material that dissolves is known as the solute. The dissolving medium is the solvent. The solution's enthalpy change can be used to calculate how much heat is produced or absorbed throughout the dissolving process.
Given 0.050 M of HCl
HCl is a strong acid
\(\rm HCl \rightarrow H+ + Cl -\)
So, the concentration of [ H ] = 0.050 M
As, [H] [OH] = 10⁻¹⁴ at 25 °C
0.050 x [OH] = 10⁻¹⁴
[OH] = 2 x 10⁻¹³ M
Thus, the hydronium-ion concentration at 25°C is 2 x 10⁻¹³ M.
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Sometimes people do not want to change their belief regardless of the evidence.
True or False
Answers
Answer:
True
Explanation:
Ex. People against vaccines tend to believe crazy theories over facts because they think they'll end up brainwashing them.
? Match the states of matter to their properties. Drag the items on the left to the correct location on the right. solids Indefinite shape, but definite volume liquids indefinite shape and indefinite volume M gases definite shape and definite volume lowest density particles glide past each other highest density Done Try hear
Answers
Answer:
Solids: definite shape and definite volume (highest density)
Liquid: indefinite shape and definite volume (glide past each other)
Gas: indefinite shape and indefinite volume (lowest density)
Explanation:
look at the answer
How many Joules of heat are needed to raise the temperature of 500. grams of water from 15.0ºC to 20.0ºC?
Answers
Answer: 2,090J
The equation to find the specific heat is determined by the equation q = mcΔT, where q = total heat, m=mass, c = specific heat, and ∆T change in temperature.
Recall that the specific heat capacity for water is 4.18J/gºC
So, plug this along with your specific values into the equation.
q = 100g * (4.18J/gºC) * (20.0ºC-15.0ºC)
q = 2090J
what is the ph of a solution where 50.0 ml of 0.050 m nh3 (kb = 1.8 * 10-5) is mixed with 12.0 ml of 0.10 m hydrobromic acid (hbr)?
Answers
The pH of the solution where 50.0 mL of 0.050 M NH3 (Kb = 1.8 * 10-5) is mixed with 12.0 mL of 0.10 M hydrobromic acid (HBr) is 5.57.
The pH of a solution where 50.0 ml of 0.050 M NH3 (Kb = 1.8 * 10-5) is mixed with 12.0 ml of 0.10 M hydrobromic acid (HBr) can be calculated as follows:
Step 1: Write the balanced chemical equationNH3(aq) + HBr(aq) → NH4Br(aq)Step 2: Find moles of NH3 and HBrMoles of NH3 = (50.0 mL)(0.050 mol/L) = 0.0025 molMoles of HBr = (12.0 mL)(0.10 mol/L) = 0.0012 mol
Step 3: Determine which of the two reagents will run out firstNH3(aq) is a weak base and HBr(aq) is a strong acid, so they will react to form NH4+ and Br- ions. But HBr(aq) will completely dissociate in water while NH3(aq) will undergo a partial ionization. Thus, HBr will be the limiting reactant and all of the 0.0012 mol of HBr will react with 0.0012 mol of NH3 to produce NH4Br.
Step 4: Calculate moles of remaining NH3Moles of NH3 left = 0.0025 mol - 0.0012 mol = 0.0013 mol
Step 5: Calculate concentration of NH4+ ionConcentration of NH4+ ion, [NH4+] = moles of NH4+ ion/volume of solutionMoles of NH4+ ion = moles of HBr used = 0.0012 molVolume of solution = 50.0 mL + 12.0 mL = 62.0 mL = 0.062 L[NH4+] = 0.0012 mol/0.062 L = 0.019 mol/L
Step 6: Write the equilibrium equation and expression for NH4+ ionNH4+(aq) + H2O(l) ⇌ H3O+(aq) + NH3(aq)Kb = [H3O+][NH3]/[NH4+]
Since Kb is given, we can find the Kb for NH4+ ion as follows:Kb * Kw/Ka = [H3O+][NH3]/[NH4+]1.8 * 10^-5 * 1.0 * 10^-14/5.6 * 10^-10 = [H3O+][0.0013]/[0.019][H3O+] = 2.7 * 10^-6pH = -log[H3O+]pH = -log(2.7 * 10^-6)pH = 5.57.
The pH of the solution where 50.0 mL of 0.050 M NH3 (Kb = 1.8 * 10-5) is mixed with 12.0 mL of 0.10 M hydrobromic acid (HBr) is 5.57.
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At a particular temperature a 0.001 M solution of H2S has a pH of 3.75. Calculate the value of Ka at this temperature at equilibrium .
Answers
The acidity or alkalinity of a solution depends upon the concentration of hydronium and hydroxide ions. The pH of a solution is the negative logarithm to the base 10 of the hydronium ion concentration in moles per litre.
The term Kₐ is the acid dissociation constant and it gives the extent to which the acid dissociates. The smaller the value of Kₐ for an acid, the acid will be weaker.
pH = -log [H₃O⁺]
[H₃O⁺] = 10⁻pH = 0.00017
[H₃O⁺] = √Kₐ . c
0.00017 = √Kₐ × 0.001
(0.00017)² = Kₐ × 0.001
Kₐ = 0.0000289 = 2.89 × 10⁻⁵
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If volume of a water sample is 11.3 ml and the mass is 11.349 g, what is the exact density of the sample?
Answers
The exact density of the water sample with volume 11.3ml and mass 11.349g is 1.004g/ml.
Density of a solution is defined as the ration of mass of the solution to the volume of the solution. Density is measured in g/cm³ for solids, g/ml for liquids, and g/L for gases.
As per the definition of density ,we can write
Density of solution = (Mass of the Solution / Volume of the solution)
Mass of the water sample = 11.349g
Volume of water sample = 11.3ml
Density of Water sample = (Mass of water sample/Volume of Water sample)
Density of Water sample = (11.349g / 11.3ml)
Density of Water sample = 1.004g/ml.
The exact density of the water sample with volume 11.3ml and mass 11.349g is 1.004g/ml.
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to make up 1 l of a 0.5 m solution of edta starting with the free acid, approximately how much 10 m naoh will have to be added to adjust the ph to 7.0? do you expect this solution to have a ph-buffering capacity? the pkas of the four acetic acid groups on edta are 2.0, 2.67, 6.16 and 10.26.
Answers
To make up 1 L of a 0.5 M solution of EDTA starting with the free acid, the pH must be adjusted to 7.0. EDTA is a weak acid with a pKa of 2.0, 2.67, 6.16, and 10.26 for the four acetic acid groups.
At a pH of 7.0, EDTA will exist in a buffered state, meaning that it will be partially protonated and partially deprotonated.
To adjust the pH of the EDTA solution to 7.0, an alkali solution such as 10 M NaOH must be added. The amount of NaOH required can be calculated using the Henderson-Hasselbalch equation:
pH = pK a + log([base]/[acid])
where [base] is the concentration of the deprotonated form of EDTA and [acid] is the concentration of the protonated form of EDTA.
At a pH of 7.0, the acid-base equilibrium of EDTA will be:
[EDTA-] = [HEDTA]
At this pH, the buffer capacity is high. Since the pKa of EDTA is close to the desired pH, the buffer will resist changes in pH caused by added acids or bases.
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structure and bonding t
Answers
Answer:
boring it
Explanation:
because boring is life style
Which statement describes the redox reaction that occurs when an object is electroplated?
A. It is spontaneous and requires an electric current.
B. It is spontaneous and produces an electric current.
C. It is nonspontaneous and requires an electric current.
D. It is nonspontaneous and produces an electric current.
Answers
Answer:
C. It is nonspontaneous and requires an electric current.
Explanation:
An oxidation-reduction (redox) reaction is a type of chemical reaction in which electrons are transferred between chemical species. In redox reactions, a reduced half and an oxidized half occur together. When an object is electroplated, the occurrence of a redox reaction is nonspontaneous and it requires an electric current.
Why is a pyramid shape used to represent the energy in an Ecosystem?
Answers
Answer:
An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.
Explanation:
In an AP Chemistry laboratory, students were given two unlabeled beakers and told that one of the beakers contained 1.0g of solid CaCO3 and the other contained
1.0g of solid AgNO3. They were told to devise an experiment to identify which compound was which. A student did so by adding 50 mL of distilled water to each beaker. Describe the student's observations that allowed him to identify each compound.
Answers
When the student adds 50 mL of distilled water to each beaker, CaCO3 will not dissolve in water while AgNO3 will dissolve completely in water.
We have to recall that according to the solubility rules, the carbonates of group two elements are insoluble in water. The solubility rules offer a convenient way of predicting the solubility of a compound in water.
When the student adds 50 mL of distilled water to each beaker, CaCO3 will not dissolve in water while AgNO3 will dissolve completely in water. This is because, the carbonates of group two elements are insoluble in water.
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I NEED HELP QUICK!! what is the equation to find the percent composition of NaHCO3????
Answers
Answer:
???????????
Explanation:
You mix 250 ml of 2.1 m hbr with 200 ml of 2.5 m KOH. What is the ph of the resulting solution?
Answers
The pH of the resulting solution when 250 mL of 2.1 M HBr is mixed with 200 mL of 2.5 M KOH is 12.7.
This can be calculated by first finding the moles of each of the reactants, and then using the ICE table to determine the concentration of ions in the solution. The equation for the ICE table is:
[H3O+] x [OH-] = KW, where KW is the ion product of water.The concentration of H3O+ can then be determined by taking the square root of the KW, and the concentration of the OH- can be calculated by dividing the KW by the H3O+ concentration. The pH can then be calculated by taking the negative log of the H3O+ concentration.
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How many neutrons are there in an atom of cobalt-60 (#27)?
Answers
What pillar of sustainability is broken by recycling
electronics in India? Should the US make a law that electronics can
only be recycled in the US?
Answers
The pillar of sustainability broken by recycling electronics in India is environmental sustainability. Implementing a law that restricts electronics recycling to the US would not necessarily be the most effective solution, as it overlooks the complex global dynamics of electronic waste management.
Recycling electronics in India often involves improper disposal methods, such as burning or dismantling without proper safety measures. This leads to environmental pollution, including the release of hazardous substances into the air, soil, and water, thus violating the principle of environmental sustainability.
However, simply mandating that electronics can only be recycled in the US may not be the most optimal solution. Electronic waste is a global issue, and restricting recycling to a single country disregards the fact that electronic products are manufactured and consumed worldwide. A more comprehensive approach to addressing electronic waste would involve international cooperation, strict regulations, and monitoring of recycling practices to ensure they meet environmental standards.
Efforts should focus on improving recycling practices globally, including promoting responsible electronic waste management, developing sustainable recycling infrastructure in multiple countries, and encouraging the adoption of safe and environmentally friendly recycling practices. This approach would foster global sustainability and address the challenges associated with electronic waste disposal more effectively than a geographically limited restriction.
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f
501
cm3 of
hydrogen
are
collected
at
25
oC
and
100.3
kPa,
how
many
cm3 will
the
gas
occupy
at
STP?
Answers
Gas volume at STP was 1.12 10 7 cm3. At STP, the volume for 1 mole per gas is calculated to be 25 litres, followed by the kind of gas and dominant force. Actual gas having a repulsive force of +ve deviation.
What does STP stand for?V=nRT/P is how this formula is written. V = n R T / P, where V is the gas's volume in L, n is indeed the number of moles, R is the real gases constant, T is indeed the gas' temperature in K, and P is the gas's pressure in atm.
Is STP 22.4?S.T.P. One mole of every gas takes up 22.4 litres of space at typical conditions of temperature and pressure of 0o and 1 atm, respectively. This volume is an approximate value, since the volume of various gases varies significantly. Every gas at S.T.P. has a molar volume of 22.4L.
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help please this is due at 2!!
Answers
Answer:
I believe the answer is C (3)
Explanation:
In an atom usually electrons number and protons number is equal.
Here lithium atom has three protons
So it has three electrons، too.
22.38 consider the structure of lysergic acid diethylamide (lsd), a potent hallucinogen containing three nitrogen atoms. one of these three nitrogen atoms is significantly more basic than the other two. identify the most basic nitrogen atom in lsd and explain your choice.
Answers
In the structure of LSD, the most basic nitrogen atom is the one that is part of the aromatic ring system. This nitrogen atom is called the indole nitrogen and is significantly more basic than the other two nitrogen atoms in LSD.
What is Atom?
An atom is the smallest unit of matter that retains the properties of an element. It is composed of a nucleus, which contains positively charged protons and uncharged neutrons, and negatively charged electrons that orbit the nucleus. The number of protons in the nucleus of an atom determines its atomic number and the element to which it belongs.
The indole nitrogen in LSD is more basic because it is part of an aromatic ring system, which provides additional stability to the lone pair of electrons on the nitrogen atom. The lone pair of electrons on the indole nitrogen is delocalized within the ring system through resonance, which makes it less available for protonation and therefore less acidic. This results in a higher basicity of the nitrogen atom, which means it is more likely to accept a proton and form a positive ion.
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how does a fire blanket work?
Answers
Answer:
Fire blanket work by placing them on the ground and wrapping them in the blanket, oxygen is excluded, and the flames diminished.
Sodium hydroxide and hydrochloric acid react in a 1:1 ratio. If 20.0 g of solid NaOH are added to 1000 mL of a solution containing 0.500 moles of HCl, the temperature of the solution rises 6.9 oC. Assuming that the total solution mass is 1000 g and the specific heat of the solution is 4.184 J/g•˚C, calculate the heat released by this reaction. Then calculate ∆Hrxn (i.e., the heat released per mole of NaOH).
Answers
A substance can absorb heat without increasing its temperature by transitioning from one physiological body. Therefore, 28869.6J is the total heat.
What is heat?Heat is energy that is transmitted through one body to the next as a result of a temperature differential. When two bodies of differing temperatures come into contact, energy is transferred (i.e., heat flows) from the hotter to the colder.
This energy transfer generally results in an increase inside the temperature of both the region of lower temperature and a reduction in the temperatures of the warmer object. A substance can absorb heat without increasing its temperature by transitioning from one physiological body.
q=m×c×ΔT
= 1000× 4.184× 6.9
=28869.6J
Therefore, 28869.6J is the total heat.
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. The gas that is the least water-soluble and can pass most efficiently through the respiratory tract is Group of answer choices Nitrogen dioxide. Sulfur dioxide. Carbon monoxide. Ozone.
Answers
The gas that is the least water-soluble and can pass most efficiently through the respiratory tract is Carbon monoxide.
This gas is the least water-soluble and can pass most efficiently through the respiratory tract. Carbon monoxide has a small molecular size and low water solubility, which makes it easier for it to enter the bloodstream and cause harm.
Nitrogen dioxide, sulfur dioxide, and ozone are all more water-soluble than carbon monoxide, making it more difficult for them to pass through the respiratory tract. Nitrogen dioxide is a toxic gas that can cause respiratory problems and lung damage. Sulfur dioxide is a common air pollutant that can cause breathing difficulties and aggravate asthma. Ozone is a highly reactive gas that can damage the respiratory system and cause breathing problems.
In summary, carbon monoxide is the gas that is the least water-soluble and can pass most efficiently through the respiratory tract. It is important to be aware of the potential dangers of carbon monoxide exposure and take measures to prevent it, such as installing carbon monoxide detectors in homes and workplaces.
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Explain why you can't accurately determine the molarity of sodium hydroxide using the number of grams dissolved in the total amount of solution
Answers
Sodium hydroxide is a strong base that readily absorbs water vapor from the atmosphere and dissolves in water. Its molarity can be determined by adding a known amount of acid of a known concentration to a sample of the sodium hydroxide solution and then titrating it until the equivalence point is reached.
However, there are several reasons why you can't accurately determine the molarity of sodium hydroxide using the number of grams dissolved in the total amount of solution. Here are a few:
1. Impurities and water content: Sodium hydroxide pellets, flakes, or crystals often contain impurities that can affect its molarity. Also, the substance absorbs water vapor from the atmosphere, which can lead to inaccurate molarity measurements.
2. Difficulty in dissolving: Sodium hydroxide is not very soluble in water, which means that it can be difficult to dissolve an accurate amount of it in a given volume of water. This can result in an inaccurate measurement of its molarity.
3. Concentration changes: The concentration of a sodium hydroxide solution can change due to changes in temperature, pressure, or concentration. This can lead to an inaccurate measurement of its molarity.
4. Reaction with glassware: Sodium hydroxide can react with glassware, which can affect its molarity measurement. In conclusion, it is not recommended to determine the molarity of sodium hydroxide using the number of grams dissolved in the total amount of solution, as it can lead to inaccurate results. Instead, titration with a known amount of acid is a more reliable method to determine its molarity.
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1. The theory of
traits of a population change over time.
Answers
The theory of traits of a population change over time explains how people can change with respect to the strength and intensity of basic trait dimensions.
What is theory of traits?Trait theory in psychology serves as the thorry that focus on the idea that people differ whichg can be attributed to their strength as well as intensity of basic trait dimensions.
It shouuld be noted that the criteria that characterize personality traits involves the act of consistency as well as stability, along with individual differences. Natural selection give us the underswtandng of how genetic traits of a species undergo change over time.
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