Question

Calculate the [H+] of the following solutions from their pH. Then, calculate experimental Ka and Kb...

Calculate the [H+] of the following solutions from their pH. Then, calculate experimental Ka and Kb values using an ICE table.

A. Acetic acid - pH=3.02

B. Ammonuim hydroxide - pH=10.53

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Homework Answers

Answer #1

A. [H+] = 10-pH = 10-3.02 M = 9.55*10-4 M

The experimental Ka value = [H+][CH3COO-]/[CH3COOH]

i.e. Ka = 9.55*10-4 * 9.55*10-4/[CH3COOH]

Kb = 10-14/Ka

Note: [CH3COOH] should be given. If it is there, you can substitute and calculate accordingly.

B. [H+] = 10-10.53 M = 2.95*10-11 M

The experimental Kb value = [NH4+][OH-]/[NH4OH]

i.e. Ka = 2.95*10-11 * 2.95*10-11/[NH4OH]

Ka = 10-14/Kb

Note: [NH4OH] should be given. If it is there, you can substitute and calculate accordingly.

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