HF(aq) + H2O(1) → H3O+(aq) + F-(aq) Ka = 6.3 x 10 at 25°C

The acid ionization equilibrium for HF is represented by the chemical equation above. A student claims that the pH of a solution that contains 0.100 MHF(aq) and 0.100 MNaF(aq) will change only slightly when small amounts of acids or bases are added. Which of the following pairs of equations can the student use to justify the claim?

a. HF(aq) + OH-(aq) → H2O(1) +F¯(aq) and ОН-(аq) + Hзо+(аq) —> 2Н2O.

b. H3O+(aq) + OH-(aq) → 2H2O(I) and F-(ag) + H30+(aq) → HF(aq) + H2O(I).

c. НF(аq) + ОН-(аq) → F- (aq) + H2O(I) → HF(aq) + ОH-(аq) - H2O(1) + F-(aq).

d. НF(аq) + ОН-(аq) —> Н2О(1) + F-(аq) and F-(aq) + H3O+(ag) → HF(aq) + H2O(I).

The IUPAC nomenclature is based on a systematic approach that involves identifying and prioritizing functional groups, substituents, and other structural features of the compound. The names of the given compounds are:

Specific priority rules are used to determine the parent chain (main carbon backbone) in organic compounds, the selection of functional groups, and the numbering of carbon atoms. Prefixes and suffixes are employed to indicate substituents, functional groups, and other structural elements present in the compound.

Learn more about IUPAC nomenclature, here:

https://brainly.com/question/14379357

#SPJ1

Therefore, a reaction would be exothermic if the sum of a enthalpies of a reactants is higher than the enthalpies of a products. A reaction is endothermic if the enthalpy on the products side is higher.

Correct option is, A.

Hence, a reaction is exothermic as well as its enthalpy will indeed be negative if it releases less energy than it takes in. See this as a certain quantity of heat evaporating from (or being removed from) the reaction. Endothermic reactions have positive enthalpies because they absorb or use more energy than they produce.

Laundry detergent powder can be quickly exothermically reacted by being dissolved in a small amount of water in your hand. Dissolving potassium chloride (offered as a salt replacement) in water in your hand is one simple endothermic reaction.

To know more about enthalpy visit:

https://brainly.com/question/13996238

#SPJ1

Among one mole carbon and one mole oxygen, one mole would contain more mass.

One mole of any quantity means that there are 6.022 x 10²³ entity of that particular quantity in that sample.

We know,

Moles = Given mass/ molar mass

Molar mass of Carbon = 12 grams/mol.

Molar mass of Oxygen = 16 grams/mol.

So, Moles of carbon is one,

we can write,

6.022 x 10²³ = mass of Carbon/molar mass of carbon

Mass of carbon = 79.56 x 10²³ grams.

Now,

Moles of oxygen is one,

we can write,

6.022 x 10²³ = mass of oxygen/molar mass of oxygen

Mass of oxygen = 106.08 x 10²³ grams.

As we can see, that the mass of the oxygen atoms is much more heavier than the carbon atoms.

To know more about moles, visit,

https://brainly.com/question/15356425

#SPJ4

D. the pupil or the dark portion at the center of the eye

Answer:

71.92 kPa

Explanation:

Using the combined gas law equation;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (kPa)

P2 = final pressure (kPa)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the information provided in this question;

T1 = 50°C = 50 + 273 = 323K

V1 = 105L

T2 = -25°C = -25 + 273 = 248K

P2 = 105.4 kPa

P1 = ?

V2 = 55.0 L

Using P1V1/T1 = P2V2/T2

P1 × 105/323 = 105.4 × 55/248

105P1/323 = 5797/248

0.325P1 = 23.375

P1 = 23.375 ÷ 0.325

P1 = 71.92 kPa

✅:The SI unit of force is the newton, symbol N. The base units relevant to force are: The metre, unit of length — symbol m. The kilogram, unit of mass — symbol kg. The second, unit of time — symbol s.

IamSugarBee

Answer the SI unit of force is newton

Answer:

The Atom is a superhero character from DC Comics. He is a founding member of the Justice League and possesses the ability to shrink himself to subatomic size. In the comics, he is Ray Palmer, a scientist from Ivy Town.

Explanation:

The molarity of the resulting solution is 0.069 M. This means that there are 0.069 moles of magnesium sulfate per liter of solution.

To calculate the molarity of the resulting solution, we need to first determine the number of moles of magnesium sulfate present in the solution.
The molar mass of magnesium sulfate is 120.37 g/mol (24.31 g/mol for magnesium + 32.06 g/mol for sulfur + 4 x 16.00 g/mol for oxygen). Therefore, 1134 g of epsom salt contains:
1134 g / 120.37 g/mol = 9.42 mol MgSO4
Next, we need to determine the volume of the solution. A 30-gallon bathtub filled with water will have a volume of approximately 136 L (assuming the density of water is 1 g/mL). Therefore, the final volume of the solution will also be 136 L.
Now, we can use the formula for molarity, which is:
Molarity = moles of solute / volume of solution in liters
Plugging in our values, we get:
Molarity = 9.42 mol / 136 L = 0.069 M

For such more questions on molarity

https://brainly.com/question/29661329

#SPJ11

Answer

Explanation:

The charge on the potassium ion is 1+. So, Option A is the correct answer from the given options.

We must ascertain the charge carried by the potassium ion.

Being a group 1 element, potassium will produce an ion with a positive charge.

Since potassium achieves an extremely stable noble gas electrical structure after losing one electron, this element possesses a steady +1 valency.

As a result, the potassium ion has a 1+ charge. The right response from the available alternatives is thus Option A.

Learn more about valence electrons here:

https://brainly.com/question/371590

#SPJ9

Answer:

1

Explanation:

If heat was lost from the calorimeter while the ice was melting, the measured value of the molar heat of fusion would be lower than the true value.

This is because some of the heat that is released when the ice melts would be absorbed by the surroundings (including the calorimeter and the air), instead of being used to heat up the water in the calorimeter.

The molar heat of fusion is defined as the amount of heat required to melt one mole of a substance at its melting point, with no change in temperature. It is usually determined experimentally using a calorimeter, which is an insulated container that can measure changes in temperature and heat flow.

In the experiment to measure the molar heat of fusion of ice, a known mass of ice is added to a calorimeter containing a known mass of water at a higher temperature. The heat released by the melting ice is absorbed by the water, causing it to cool down. By measuring the change in temperature of the water, the amount of heat released by the melting ice can be calculated, and from this, the molar heat of fusion can be determined.

If some of the heat released by the melting ice is lost to the surroundings, the measured value of the heat released will be lower than the true value, and hence the calculated molar heat of fusion will also be lower than the true value. To obtain a more accurate value of the molar heat of fusion, the heat loss from the calorimeter should be minimized by insulating the calorimeter and conducting the experiment in a thermally stable environment.

Learn more heat of fusion here:

https://brainly.com/question/30403515

#SPJ4

Answer:

Between genuine solutions and suspensions, colloids solutions and suspensions represent a middle ground. The colloid solution's solvent-dispersed particles' diameters range from 10 to 2000 A. Milk and butter are examples

The formula oh Hydride of of antimony is H3Sb.

Hydrides is the hydrogen anion with the the formula H-.It is the binary compound of the hydrogen with other elements .In this Hydrogen is covalently bonded. this is bonded to a less electronegative element. This only exists in extrema  condition. This consist of two electrons and a proton. Electronic configuration of hydride is 1S2.

[Kr]5s24d105p3 is antimony.

The formula of hydride in antimony is SbH3.This is a colorless gas and it is highly toxic. This is the main covalent hydride of antimony. This is also known as antimony hydride or hydrogen antimonite. This is the binary compound of Hydrogen with antimony.

To learn more about Hydrides of Antimony please visit:

https://brainly.com/question/13065375

#SPJ4

Answer: \(H_2O_2\rightarrow H_2+O_2\)

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for showing hydrogen peroxide decomposing into hydrogen and oxygen is:

\(H_2O_2\rightarrow H_2+O_2\)

Answer:

applied force .....I'm pretty sure

Answer:

A. Applied forces aka Contact forces

Explanation:

Thos force is created when you apply forces to an object as in a push/pull or other physical ways.

I hope it helps! Have a great day!

Anygays-

Answer:

um you can have your opinions

Explanation:

I have actually :) he is indeed bae whats your favourite song?

Answer:

\(\Large \boxed{\mathrm{A}}\)

Explanation:

Rust formed from iron and oxygen combining is a chemical change, because in a chemical change, the resulting substance(s) will have different properties from the substance(s) before the chemical change.

I cant comment... So is it Right?

Answer:

A is the answer it is correct

Answer:

A

Explanation:

trust me

It is formed via the more/most stable carbocation.

What justification exists for Markovnikov's Rule?

A carbocation is created as a result of the protonation of the alkene by the protic acid. The carbocation that has the most alkyl substituents on its carbon holds the positive charge, making it the most stable carbocation. As a result, the addition of the halide to the carbon that has fewer hydrogen substituents makes up the majority of the product.

Markovnikov's rule

According to the Markovnikov rule, a proton is added to the carbon atom with the greatest number of hydrogen atoms connected in addition to processes involving alkenes or alkynes.

Anti-Markovnikov Rule

According to the Anti-Markovnikov Rule, in addition to reactions between alkenes or alkynes, The carbon atom with the fewest hydrogen atoms linked to it receives the proton.

Learn more about Carbocation here:-

https://brainly.com/question/14363695

#SPJ4

Answer:

The answers to your questions are given below

Explanation:

1. 3 Na2SO4

Molecules of Na2SO4 = 3

Na (sodium) = 3 x 2 = 6

S (sulphur) = 3 x 1 = 3

O (oxygen) = 3 x 4 = 12

2. 4 Pb(NO3)2

Molecules of Pb(NO3)2 = 2

Pb (lead) = 4 x 1 = 4

N (nitrogen) = 4 x 2 x 1 = 8

O (oxygen) = 4 x 3 x 2 = 24

The concentration of NO3-N in mg/L = 10 mg/L.

The given water sample contains 10 mg NO3/L.

To find the concentration of NO3 in millimoles/L:

1 mg = 1/1000 g1 mole of NO3 contains 1 + 3x16 = 61 g NO3So, 1 g NO3 = 1/61 mole NO3

Thus, 10 mg NO3 contains (10/1000) * (1/61) mole of NO3= 0.000163934426 mole of NO3

Therefore, the concentration of NO3 in millimoles/L = 0.000163934426 * 1000= 0.163934426 millimoles/L

To find the concentration of NO3-N in mg/L:1 mole of NO3 contains 1 mole of N= 14 g N

Thus, 1 g NO3-N = 1/14 mole of NO3-N

Therefore, 10 mg NO3-N contains (10/1000) * (1/14) mole of NO3-N= 0.000714285714 mol of NO3-N

Therefore, the concentration of NO3-N in mg/L = 0.000714285714 * 14000= 10 mg/L.

To know more about concentration in a solution visit:

https://brainly.com/question/30862855

#SPJ11

The tapetum lucidum, a reflective substance found in the choroid coat of cows, is responsible for a cow's ability to see at night by reflecting light that is absorbed by the retina back into the retina.

Many vertebrates and certain other creatures have a tissue layer in their eyes called the tapetum lucidum. There is a retroreflector directly behind the retina. It increases the amount of visible light that is available to the photoreceptors by reflecting it back through the retina (although slightly blurring the image). Some animals have excellent night vision thanks to the tapetum lucidum. The majority of these creatures are nocturnal, particularly the carnivores, while others are deep-sea creatures.

Some spider species have comparable adaptations. Humans are haplorhine primates, which do not have a tapetum lucidum and are nocturnal. Animals can see in lower light than they otherwise could thank to the presence of a tapetum lucidum. Iridescent tapetum lucidum reflects light roughly in accordance with thin-film optics' interference principles.

Learn more about tapetum lucidum here:

https://brainly.com/question/19260195

#SPJ4

The balanced reaction for the dissociation of ammonium nitrate in water is:

NH₄NO₃(s) → NH₄⁺ (aq) + NO₃⁻(aq)

When ammonium nitrate (NH₄NO₃) is dissolved in water, it dissociates into its constituent ions, ammonium (NH₄⁺) and nitrate (NO₃⁻). This dissociation occurs due to the strong ionic bonds between the ammonium and nitrate ions being broken by the polar water molecules. The balanced equation for this dissociation reaction can be represented as:

NH₄NO₃(s) → NH₄⁺ (aq) + NO₃⁻(aq)

In this equation, (s) represents the solid state of ammonium nitrate, while (aq) denotes the aqueous or dissolved state of the ions in water. The arrow indicates the direction of the reaction, showing the conversion of solid ammonium nitrate into its dissociated ions in the aqueous solution.

The ammonium ion (NH₄⁺) consists of one nitrogen atom bonded to four hydrogen atoms, while the nitrate ion (NO₃⁻) consists of one nitrogen atom bonded to three oxygen atoms. These ions are stabilized by the polar nature of water, which surrounds and solvates them due to its ability to form hydrogen bonds.

The dissociation of ammonium nitrate in water is an example of a strong electrolyte, as it produces a high concentration of ions in solution. This makes ammonium nitrate a commonly used compound in various industrial applications, such as fertilizers, explosives, and as a reagent in laboratory reactions.

Ammonium nitrate is a widely used compound with diverse applications in different industries. Its dissociation in water is an essential process to understand its behavior as a strong electrolyte.

By dissociating into ammonium and nitrate ions, it provides a ready source of these ions for chemical reactions. The understanding of dissociation reactions helps chemists predict the behavior of various substances in solution and aids in designing efficient chemical processes.

Learn more about ammonium nitrate

brainly.com/question/5148461

#SPJ11

The product of molar concentration of ion present in chemical reactants raised to the power of number of ions produced per chemical compound in a saturated solution is called: solubility product.

Solubility product can be defined as a product of the molar concentration of ion present in two or more chemical reactants raised to the power of number of ions produced per chemical compound in a saturated solution.

Mathematically, the solubility product is given by this formula:

\(K_{sp} = [A^+]^x[B^{-}]^y\)

Where:

In Chemistry, the solubility product is typically used as an equilibrium constant for the dissolution of a chemical compound in a saturated solution.

Read more on solubility product here: https://brainly.com/question/9905859

changes in the Sun's magnetism produce a greater number of sunspots, more energy and cause solar eruptions of particles

The inside of the flask and burette tip are rinsed with water during titration to ensure that all the reagents are completely transferred and react with each other, thus providing accurate results.

During titration, it is crucial to have an accurate measurement of the reagents being used. Rinsing the inside of the flask and burette tip with water helps remove any residual reagent from previous experiments or handling. This ensures that the exact amount of reagent is introduced into the flask, leading to a more precise reaction.

Additionally, rinsing the burette tip with the titrant solution ensures that the initial reading of the burette is accurate. Any water droplets present in the tip can cause a difference in volume, which may lead to inaccurate results.
If the flask and burette tip are not rinsed properly, residual reagents or water droplets may interfere with the reaction, causing an inaccurate measurement of the endpoint. This can lead to errors in determining the concentration of the analyte.
Rinsing the inside of the flask and burette tip with water during titration is a critical step to ensure accurate measurements and reliable results. It helps remove any residual reagents and ensures that the proper amount of reagent is introduced into the flask for a complete reaction. Failure to do so may lead to errors in the outcome of the titration.

For more information on burette kindly visit to

https://brainly.com/question/2957407

#SPJ11

The Ground state electronic configuration of  Cr2+:[Ar] 3d4, Cu2+: [Ar] 3d9, Co3+: [Ar] 3d6

Electronic configuration, sometimes referred to as electronic structure or electron configuration, is the arrangement of electrons in orbitals that surround an atomic nucleus.

1. Cr2+

Atomic no.of Chromium(Cr)=24  

a ground state Chromium's electronic structure is as follows: [Ar] 4s1 3d5 = 1s2 2s2 2p6 3s2 3p6

(Atomic no.of [Ar](argon) = 18)

so,ground state electronic configuration for Cr2+:

[Ar] 4s0 3d4 =[Ar] 3d4

so, ground state electronic configuration of Cr2+:

[Ar] 3d4

2. Cu2+

Atomic number of Copper(Cu)= 29

Ground state electronic configuration of Cu:

[Ar] 4s1 3d10

so, ground state electronic configuration of Cu2+:

[Ar] 4s0 3d9 = [Ar] 3d9

so,electronic configuration of Cu2+:

[Ar] 3d9

3.Co3+

Atomic number of Cobalt(Co)=27

Ground state electronic configuration of Co:

[Ar] 4s2 3d7

so,electronic configuration of Co3+:

[Ar] 4s0 3d6 = [Ar] 3d6

So,electronic configuration of Co3+:

[Ar] 3d6

Therefore the Ground state electronic configuration of

Cr2+:[Ar] 3d4, Cu2+: [Ar] 3d9, Co3+: [Ar] 3d6

To learn more about electronic configuration visit

https://brainly.com/question/29757010

#SPJ4

To answer the given questions, we will utilize Dalton's Law of Partial Pressures and the Ideal Gas Law. Let's go through each part step by step:

a. Dalton's Law of Partial Pressures states that in a mixture of gases, the total pressure exerted is equal to the sum of the partial pressures of each gas. In this case, we have two gases, N2 and He2, in the sealed container.

The contribution of N2 gas to the total pressure can be calculated by multiplying the mole fraction of N2 by the total pressure. Similarly, the contribution of He2 gas to the total pressure can be calculated by multiplying the mole fraction of He2 by the total pressure.

b. To calculate the moles of N2 gas, we need to use its molar mass. The molar mass of N2 is approximately 28 g/mol. We divide the mass of N2 (5 grams) by its molar mass to obtain the number of moles.

c. To calculate the moles of He2 gas, we need to use its molar mass. The molar mass of He2 is approximately 4 g/mol. We divide the mass of He2 (20 grams) by its molar mass to obtain the number of moles.

d. To calculate the partial pressure of N2 gas, we will use the Ideal Gas Law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the formula, we can solve for P: P = (n * R * T) / V. Plug in the values of n (moles of N2 gas), R (ideal gas constant), T (temperature in Kelvin), and V (volume) to calculate the partial pressure of N2 gas.

e. To calculate the partial pressure of He2 gas, we use the same formula as in part d, but this time we plug in the moles of He2 gas and other known values to calculate the partial pressure.

f. To calculate the total pressure of the gas inside the container, we use Dalton's Law of Partial Pressures, which states that the total pressure is the sum of the partial pressures of each gas. Add the partial pressures of N2 gas and He2 gas to obtain the total pressure.

To learn more about mass, refer below:

https://brainly.com/question/19694949

#SPJ11