for nitrous acid, hno2, ka = 4.0 × 10–4. calculate the ph of 0.33 m hno2.
Answers
The pH of a 0.54 M solution of nitrous acid is 1.83, and the correct option is A.
The pH of a 0.54 M solution of nitrous acid, HNO2, can be calculated using the given Ka value of 4.0 x 10^-4. The balanced equation for the dissociation of nitrous acid is: HNO2 (aq) ⇌ H+ (aq) + NO2- (aq)
Let x be the concentration of H+ and NO2- ions produced by the dissociation of HNO2. The initial concentration of HNO2 is 0.54 M, so the equilibrium concentration of HNO2 is (0.54 - x) M. Using the Ka expression for nitrous acid, we can write: Ka = [H+][NO2-]/[HNO2]
Substituting the equilibrium concentrations and Ka value, we get: 4.0 x 10^-4 = x^2 / (0.54 - x)
Solving for x using the quadratic formula, we get: x = 1.8 x 10^-2 M
The pH of the solution can be calculated using the equation: pH = -log[H+]
Substituting the value of [H+] into the equation, we get: pH = -log(1.8 x 10^-2) = 1.83
As a result, (a) is the right answer because the pH of a 0.54 M solution of nitrous acid is 1.83.
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Complete question:
For nitrous acid, HNO2, Ka 4.0 x 10 . Calculate the pH -4 of 0.54 M HNO2. . 54 -X -.54-.0l4
a. 1.83
b. 0.27
C. 3.67
d. 12.17
e. none of these
Related Questions
True or false? Down syndrome is caused by a mutation that accounts during DNA replication which causes in nucleotide base to be substituted for another
Answers
Answer:
True
Explanation:
Potassium metal reacts with chlorine gas to form solid potassium chloride. Answer the following:
Write a balanced chemical equation (include states of matter)
Classify the type of reaction as combination, decomposition, single replacement, double replacement, or combustion
If you initially started with 78 g of potassium and 71 grams of chlorine then determine the mass of potassium chloride produced.
Answers
The reaction between pottasium metal and chlorine gas is an example of combination reaction and the balanced equation is as follows: 2K + Cl₂ → 2KCl
What is a chemical equation?A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.
A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.
According to this question, potassium metal reacts with chlorine gas to form solid potassium chloride. The balanced equation is as follows:
2K + Cl₂ → 2KCl
Based on the above equation, pottasium combines with chlorine chemically to form pottasium chloride compound, hence, it is an example of combination reaction.
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what is the entropy change when 1.65 moles of chcl₃ condenses at 61.0 °c? [∆h(vap) = 29.6 kj/mol at 61.0 °c]
Answers
The entropy change when 1.65 moles of CHCl₃ condenses at 61.0 °C is approximately: -146.2 J/K.
The entropy change when 1.65 moles of CHCl₃ condenses at 61.0°C can be calculated using the formula:
ΔS = - (n * ΔH(vap) / T)
where ΔS is the entropy change,
n is the number of moles,
ΔH(vap) is the enthalpy of vaporization, and
T is the temperature in Kelvin.
T(K) = T(°C) + 273.15
T(K) = 61.0 + 273.15 = 334.15 KStep 2: Calculate the entropy change:
ΔS = - (1.65 moles * 29.6 kJ/mol) / 334.15 KStep 3: Convert ΔH(vap) to J/mol (1 kJ = 1000 J):
ΔH(vap) = 29.6 kJ/mol * 1000 J/kJ = 29,600 J/molStep 4: Calculate ΔS:
ΔS = - (1.65 moles * 29,600 J/mol) / 334.15 K
ΔS = - (48,840 J) / 334.15 K
ΔS ≈ -146.2 J/K
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The introduction of DDT (dichlorodiphenyltrichloroethane) and other ____________ pesticides into agriculture after World war II changed pest control and food production
Answers
The introduction of DDT (dichlorodiphenyltrichloroethane) and other synthetic pesticides into agriculture after World War II changed pest control and food production. What are pesticides? Pesticides are chemicals that are used to kill pests. Pests are defined as any organism that interferes with human activity, like insects that damage crops or rodents that spread disease. Synthetic pesticides were created after World War II.
They include DDT (dichlorodiphenyltrichloroethane) and other synthetic pesticides. What was the impact of the introduction of synthetic pesticides? The introduction of synthetic pesticides like DDT had a major impact on pest control and food production. These pesticides allowed for increased crop yields and better control over insect and rodent populations.
However, they also had negative effects on the environment and human health. Pesticides can contaminate soil and water, harm beneficial organisms, and lead to the development of pesticide-resistant pests. They can also cause health problems for humans, including cancer, reproductive issues, and neurological damage.
The use of synthetic pesticides continues to be a controversial issue, with advocates for both sides of the argument. Some argue that they are necessary for efficient food production, while others argue that they are too harmful to be used safely.
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Determine the energy in joules of a photon whose frequency is 3.75 x 1017 Hz.
Plz help my grade and life depend on it
Answers
Answer:
The energy of photon is 24.86×10⁻¹⁷ J
Explanation:
Given data:
Frequency of photon = 3.75×10¹⁷ Hz
Energy of photon = ?
Solution:
Formula:
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
E = 6.63×10⁻³⁴ Js × 3.75×10¹⁷ Hz
Hz = s⁻¹
E = 24.86×10⁻¹⁷ J
Thus, the energy of photon is 24.86×10⁻¹⁷ J
A 1.03×10−6mol sample of Sr(OH)2 is dissolved in water to make up 25.0 mL of solution. What is the pH of the solution? Round the answer to three significant figures. Select the correct answer below: 4.08, 9.92, 9.61, 8.31
Answers
The pH of the solution is 9.92, The pH of a solution involves calculating the concentration of hydrogen ions in the solution
Sr(OH)2 (s) → Sr2+ (aq) + 2 OH- (aq)The next step is to calculate the concentration of hydroxide ions in the solution using the stoichiometry of the balanced equation. We are given that 1.03×10−6 moles of Sr(OH)2 are dissolved in 25.0 mL of solution, so we can use the following equation to calculate the concentration of hydroxide ions:[OH-] = 2 × (1.03×10−6 mol)/(0.0250 L) = 8.24×10−5 M
Finally, we can use the relationship between the concentration of hydroxide ions and the concentration of hydrogen ions in water to calculate the pH of the solution:pOH = -log[OH-] = -log(8.24×10−5) = 4.08pH = 14 - pOH = 14 - 4.08 = 9.92
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What properties does metals tend to have
Answers
Answer:
1. can conduct heat and electricity.
2. are solid in room temperature except mercury.
3. they are malleable
Answer:
kim loại phổ biến nhất có thể như sắt (e), nhôm (Al), đồng (Cu), vàng (Au), bạc (Ag), Kẽm (Zn)…
Explanatio:
Water trapped inside the cracks of rocks may freeze during the winter. As a result of this,____________________.
A) earthquakes are likely to occur
B) rocks are likely to break apart
C) diamonds are likely to form
D) volcanic rocks are likely to form
Answers
\( \LARGE{ \underline{ \orange{ \sf{Required \: answer:}}}}\)
The water trapped inside the cracks of the rocks will freeze during the winter season. They will contract and will form ice which will apply pressure on the rocks. This will cause them to break apart and turn into smaller pieces. Hence the correct option is:
\( \large{ \boxed{ \bf{Option \: B}}}\)
The above phenomenon is responsible for the physical weathering of rocks to form soil.
what is the name of chewed food formed in the mouth?
Answers
The figure shows the mass spectrometry graph for an unknown element. According to the graph, what is the average atomic mass of the element?
A. 52.00 amu
B. 62.44 amu
C. 41.94 amu
D. 40.94 amu
Answers
Answer:
Option A. 52.00 amu
Explanation:
From the question given above, the following data were obtained:
Isotope A:
Mass of A = 49.946 amu
Abundance (A%) = 4.345%
Isotope B:
Mass of B = 51.941 amu
Abundance (B%) = 83.789%
Isotope C:
Mass of C = 52.941 amu
Abundance (C%) = 9.501%
Isotope D:
Mass of D = 53.939 amu
Abundance (D%) = 2.365%
Average atomic mass =.?
The average atomic mass of the unknown element can be obtained as follow:
Average atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] [(Mass of C × C%)/100] + [(Mass of D × D%)/100]
Average atomic mass = [(49.946 × 4.345)/100] + [(51.941 × 83.789)/100] + [(52.941 × 9.501)/100] + [(53.939 × 2.365)/100]
= 2.170 + 43.521 + 5.029 + 1.276
= 51.996 ≈ 52.00 amu
Therefore, the average atomic mass of the unknown element is 52.00 amu
3. Write chemical formula for the following
(a) nitrogen
(b) aluminium
Answers
Answer:
a.N
b.Al
Explanation:
nitogen is N in upper case and aluminium is Al.always the second letter is lower case
A drop of water contains 2 x 10^4 bacteria. How many bacteria are in 100 gallons of water? [1 drop = 1 mL]
Answers
Answer:
Number of bacteria in 100 gallons 757082.4×10⁴.
Explanation:
Given data:
Number of bacteria in one drop of water = 2×10⁴
Number of bacteria in 100 gallons = ?
Solution:
It is given that one drop of water is equal to the 1mL.
Now we will calculate the number of milliliters in 100 gallons.
1 gallons = 3785 mL
100× 3785.412 mL = 378541.2 mL
Now we will calculate the number of bacteria in 378541.2 mL or 100 gallons.
378541.2 mL × 2×10⁴ bacteria
757082.4×10⁴ bacteria
A sample of helium gas is allowed to expand in a process that is adiabatic and quasistatic. As the gas cools from 105 degree C to 101 Degree C, it does 3.05 J of work on a piston. How many helium atoms are there in the sample?
Answers
According to the question, helium atoms are there in the sample is (3.05 J/P) / (R × (105 + 273.15 K)) × 6.02 x 10²³ atoms/mol.
What is helium atoms?Helium atoms are the second most abundant type of atom in the universe. They are the simplest of all atoms, consisting of only two protons and two neutrons. Helium atoms are extremely lightweight, with an atomic weight of only four, making them the second lightest element after hydrogen.
The number of helium atoms in the sample can be calculated using the ideal gas law: n = PV/RT
where n is the number of moles, P is the pressure, V is the volume, R is the ideal gas constant, and T is the temperature.
Since the process is adiabatic and quasistatic, the pressure and volume of the sample can be determined from the work done on the piston:
W = P(V2 - V1)
where W is the work done, V2 is the final volume, and V1 is the initial volume.
Since the work done is 3.05 J, the final volume is 3.05 J/P. The initial volume can be determined from the ideal gas law, using the initial temperature of 105°C and the number of moles (which is unknown).
n = PV1/RT1
where n is the number of moles, P is the pressure, V1 is the initial volume, R is the ideal gas constant, and T1 is the initial temperature.
Substituting the values into the ideal gas law, we can solve for the number of moles: n = (3.05 J/P) / (R × (105 + 273.15 K))
Once the number of moles is determined, the number of helium atoms can be calculated by multiplying by Avogadro's number.
N = n × 6.02 x 10²³ atoms/mol
Therefore, the number of helium atoms in the sample is:
N = (3.05 J/P) / (R × (105 + 273.15 K)) × 6.02 x 10²³ atoms/mol.
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Rearrange the materials so the one that absorbs the most visible light energy is at the top and the one that absorbs the least is at the bottom
high transparency glass
asphalt that is wet and rough
asphalt that is dry and rough
cotton thats been dyed pink
Answers
The arrangement of materials in decreasing order of absorption of visible light energy from the top to the bottom will be wet and rough asphalt, dry and rough asphalt, dyed pink cotton, and high transparency glass.
The materials can be arranged in the order of the absorption of visible light energy from the top to the bottom, as follows:Wet and rough asphaltDry and rough asphaltDyed pink cottonHigh transparency glassThe asphalt that is wet and rough has the highest absorption of visible light energy because it is dark in color and has a rough surface that scatters the incoming light in different directions, which leads to more absorption. The dry and rough asphalt comes second because it is also dark in color, but less light is absorbed due to the smoother surface that reflects a significant amount of light.
Dyed pink cotton will absorb a moderate amount of visible light energy because it is a dark-colored material but not as dark as asphalt, so it does not absorb as much energy. High transparency glass has the least absorption of visible light energy, as it is a highly transparent material, so most of the light passes through it, causing very little absorption.
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Which type of property?
Temperature: The amount of heat in a substance. It is measured in degrees. For
example: "This water sample has a temperature of 32 degrees Celsius."
O intensive property
O extensive property
Answers
Temperature is an intensive property.
A property of matter that is intensive depends solely on the kind of matter in a sample and not on the quantity.An intensive property is a property that does not depend on the amount taken. It is the same whether we take a small sample of it or a large sample of it.On the other hand, an extensive property is a property that does depend on the amount it has been taken into consideration.Temperature, similar to pressure or density, is called an intensive property—one that is independent of the quantity of matter being considered—as distinguished from extensive properties, such as mass or volume.To learn more about intensive property visit:
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ACELLUS LAB-ACID BASE TITRATION
a student overshot the equivalence point when he was using NaOh to determine the concentration of an unknown acid, HA. What ions are present in the purple solution in the flask?
Answers
Answer: A-, NA+ And OH-
Explanation: Thank me later
If the accepted value for the density of rubber is 1.15 g/mL, what is your percent error for each rubber
stopper?
Answers
Answer:
4.34%
Explanation:
The accepted value for the density of rubber is 1.15 g/mL
Let the calculated value for the density of rubber is 1.2 g/mL
We need to find the percent error for rubber stopper. It can be calculated as follows :
\(\text{Error}=\dfrac{|\text{actual value-calculated value}|}{\text{actual value}}\times 100\\\\\text{Error}=\dfrac{1.15-1.2}{1.15}\times 100\\\\\text{Error}=4.34\%\)
So, the percent error for the density of rubber is 4.34%.What is the volume of the water plus the rock
Answers
One way to measure the volume of an irregular object (a rock in your case) is to completely submerge it in water and measure the change in height of the water level. This change in water level (let's say from 50ml to 65ml) indicates that the volume of the stone is 15ml.
What are the ways to measure the volume of the water plus the rock ?The volume of the stone depends on the size of the stone. Since rocks are irregularly shaped bodies, their volume is easily determined by the displacement of water. When an object is placed in water, the amount of water displaced by the object is equal to the volume of the object. Density is an important property of rocks as it helps identify the type of rock and its geological structure.
To calculate the density of a rock, we need to divide the rock's mass by its volume. The latter can be determined by placing the rock in a graduated cylinder filled with water.
Calculation ;Add 30ml of water to the graduated cylinder. 30 ml is the starting water volume. Carefully put the stone into the water. You will see the water level in the graduated cylinder rise. Suppose that the water level rises to 50 ml when a stone is added. 50 ml is the final volume of water.
To find the volume of the stone, subtract the initial water volume from the final water volume: 50ml - 30ml = 20ml. So the volume of the rock will be 20 ml or 20 cm³.
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geologists attempting to locate metallic mineral resources such as copper and iron will first consider the ____ of the rock and how it formed.
Answers
Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals.
What do you do to find mineral resources first?Search for Potential Deposits, Locating areas that are likely to contain mineral deposits is one of the first steps in the exploration process. Prospective areas might be close to other known mineralization areas or to active mine sites because mineral deposits frequently form in clusters.Minerals can be located using geochemical surveys and remote sensors that analyze satellite images. Following that, mining or quarrying is used to remove many minerals. Pumping, however, can be used to extract liquid minerals like oil or gas.When choosing which deposit to pursue, some factors include the deposit's location and shape, the rock's strength, the grade of the ore, the costs associated with mining it, and the commodity's current market price.To learn more about minerals refer to:
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How many moles of AgNO3 must react to form 0.854 mol Ag?
mol AgNO3
Answers
Answer:
0.854
Explanation:
The equation of its dissolution in water is: AgNO3 → Ag + (aq) + NO3- (aq)
and AgNO3 → Ag + (aq) + NO3- (aq)
1 mol 1mol 1mol
? -------- 0.854mo
so for finding the value, it is sufficients to complute 1 x 0.854 mol =0.854 mol
so, 0.854 mol is required for the reaction to form 0.854 mol of Ag
Please help!!!
True or False: A physical property is a property of a substance that can be observed or measured without changing the chemical identity of the substance.
True? Or False?
Answers
Answer:True
Explanation:
define the term "filtration"
Answers
Answer:
the action or process of filtering something. hope this helps :D
a photon has a frequency of 3.68 x 10^6 Hz calculate its energy
Answers
1. Write the chemical symbol for each of the following elements.
Aluminum
Beryllium
Calcium
Flourine
Neon
Nitrogen
Silicon
Silfur
2. Write the name of the element for each of the following symbols.
Ar
B
Li
Na
Fe
3. What is the atomic number for the following elements?
C
Fe
Pb
O
N
Zn
Answers
Answer:
Chemical symbol:
Aluminum:Al
Berylium: Be
Calcium: Ca
Flourine: F
Neon: Ne
Nitrogen: N
Silicon: Si
Silfur: S
Element name
Ar: Argon
B: Boron
Li: Lithium
Na: Sodium
Fe: Iron
Atomic number
C:6
Fe: 26
Pb: 82
O: 8
N: 7
Zn: 30
Answer:
aluminum- Al
beryllium- Be
calcium- Ca
flourine- F
neon- Ne
nitrogen- N
silicon- Si
sulfur- S
_____________________________________________________
Ar- argon
B- boron
Li- lithium
Na- sodium
Fe- iron
______________________________________________________
C- 6
Fe- 26
Pb- 82
O- 8
N- 7
Zn- 30
Explanation:
What is the balanced form of the chemical equation shown below?
C2H5OH() + O2(9)
H2O() + CO2(9)
A. C2H5OH() + 302(9) — 3H20() + 2002(9)
B. 2C2H5OH() + O2(g) – 5H20(1) + CO2(g)
C. C2H20(1) + 202(9)
-
H20(1) + 2C02(9)
D. C2H5OH() + O2(g) → H20(1) + CO2(g)
Answers
Answer:
C2H5OH +3O2 = 2Co2+ 3H2O
Explanation:
The balanced chemical equation is C2H5OH + 302 → 3H20 + 2CO2.
What is balanced chemical equation?A balanced chemical equation is one in which the count of atoms in all of the molecules is equivalent on both sides of the equation. The balancing of a particular chemical equation is governed by the Law of Conservation of Mass.
Balancing chemical equation is shown as below:
It can be seen that the count of carbon atom in left side 2 on the other hand the count of carbon in right side only one. By multiply with 2 in right side of the reaction , equation will be balanced.
Therefore, the balanced chemical equation is C2H5OH + 302 → 3H20 + 2CO2.
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The mass number of an atom is
59 and the number of neutrons in
the nucleus of the atom is 32, then
the atomic number is?
Answers
Answer:
Cobalt
Explanation:
I think it is cobalt
Answer:
cobalt
Explanation:
What types of changes do you observe between the rock formations in the two images?
Answers
In general, changes in rock formations can occur due to a variety of factors, including weathering, erosion, tectonic activity, and sedimentation.
What is Rock Formation?
Rock formation refers to the process by which rocks are created, transformed, or modified over time through various geological processes. This process involves the deposition of sediments, the consolidation and hardening of sediments into rock layers, and the metamorphism of existing rocks due to heat, pressure, and other factors.
There are three main types of rocks: igneous, sedimentary, and metamorphic. Igneous rocks form from molten magma or lava that cools and solidifies, while sedimentary rocks are formed from the accumulation of sediments, such as sand, mud, and organic material. Metamorphic rocks are formed from the transformation of existing rocks under high heat, pressure, and chemical reactions.
Weathering and erosion can cause rocks to break down and change shape over time, while tectonic activity can cause rocks to shift and deform. Sedimentation can lead to the formation of new rock layers on top of existing ones.
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what is the agriculture thallium?
Answers
Answer:is a trace metal of severe toxicity. Its health concerns via consumption of contaminated vegetables have often been overlooked or underestimated
Explanation: Read it carefully and it explains
When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?.
Answers
For getting an indication whether a chemical reaction or chemical change has taken place, if B)Heat is given off then chemical reactions occur. So,correct option is B.
Chemical reactions are surrounding us, from the digestion of food in our body to how the light we get from the sun is the consequence of compound responses. Prior to starting with compound responses, realizing about physical and synthetic changes is significant
Option A can't be the response is dissolving is an actual change. No substance response occurred.
Option B is the response as it is an EXOTHERMIC reaction so intensity will be emitted.
Option C can't be the response as dissolving is essentially ions becoming particles, not a synthetic response by which a reactant responds with one more reactant to shape an item.
Option D can't be the response. Same explanation with respect to why An isn't the response.
Hence, correct option is B.
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(Complete question) is:
When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place? A) Solid melts. B) Heat is given off. C) Substance dissolves D) Substance changes shape.
Draw the neutral organic product that results from the given reaction. Include all hydrogen atoms. CH_3CH_2CH_2OH(I) H_2SO_4 (conc) /200^∘C
Answers
The neutral organic product obtained from the reaction is propene (CH3CH=CH2)
What is the role of concentrated sulfuric acid in the dehydration of 1-propanol?The given reaction involves the dehydration of 1-propanol (CH3CH2CH2OH) in the presence of concentrated sulfuric acid (H2SO4) at 200°C. Dehydration is the removal of a water molecule from the alcohol compound. In this case, 1-propanol loses a water molecule to form propene (CH3CH=CH2), which is an alkene.
The neutral organic product resulting from this reaction is propene (CH3CH=CH2). The reaction occurs as the hydroxyl group (-OH) of 1-propanol is protonated by the acidic H2SO4, leading to the loss of a water molecule. This creates a double bond (C=C) between the second and third carbon atoms, resulting in the formation of propene.
Thus, the neutral organic product obtained from the reaction is propene (CH3CH=CH2).
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