The pH of 0.259 M solution of an unknown acid is measured to be 2.353. What is the Ka of the acid?

Answers

Answer 1

Answer:

[tex]Ka=7.73x10^{-5}[/tex]

Explanation:

Hello!

In this case, since the pH is measure of the amount of hydrogen ions in solution, first given the pH we can compute the concentration of hydrogen ions via:

[tex]pH=-log([H^+])[/tex]

[tex][H^+]=10^{-pH}=10^{-2.353}=4.436x10^{-3}M[/tex]

Thus, since the ionization of the given acid, leads to the following equilibrium expression as it is a weak one:

[tex]Ka=\frac{[H^+][A^-]}{[HA]}[/tex]

We notice the concentration of hydrogen ions equal the concentration of the acids conjugate base, so we can compute:

[tex]Ka=\frac{4.436x10^{-3}*4.436x10^{-3}}{0.259-4.436x10^{-3}}\\\\Ka=7.73x10^{-5}[/tex]

Best regards!

Related Questions

How many kJ of heat are needed to completely melt 1.70 moles of H2O, given that the water is at its melting point? The heat of fusion for water is 6.02 kJ/mole.

Answers

Answer:

1.70×6.02=6.4414

Explanation:

it would be times

10.2234 kJ of heat is needed to completely melt 1.70 moles of H2O, given that the water is at its melting point and the heat of fusion for water is 6.02 kJ/mole.

What is latent heat?

The term "latent heat" refers to the heat energy that a substance retains when its phase changes during a specific process. The latent heat of evaporation, which occurs when a liquid absorbs heat from an external source at its boiling point, is one of many types of latent heat.

Similarly, the latent heat of fusion is used when any substance melt at its melting point to change the liquid phase of that substance.

As given in the problem, The heat of fusion for water is 6.02 kJ/mole. This means 6.02 kJ heat is needed to melt 1 mole of ice into water

Then the heat are needed to completely melt 1.70 moles of H2O,

Heat = 1.70 moles ×6.02 kJ/mole

Heat = 10.2234 kJ

Thus, the heat needed to completely melt 1.70 moles of H2O is 10.2234 kJ

Learn more about Latent heat from here

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Choose the formula for ammonium.
ΝΗ,
b NH3
C
(NH)3N

Answers

Answer:

NH4+ will be ammonium, NH3 is ammonia which is the conjugate base of ammonium.

Explanation:

Which symbol in a chemical equation separates the reactants from the products?

Answers

Answer:

The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.

Explanation:

Why series fatty acid carbons seen in double from?

Answers

Stearic acid is a fully saturated fatty acid with no carbon-carbon double bonds. (Bottom) Oleic acid is an unsaturated fatty acid.

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