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Find the pH of each of the following solutions of mixtures of acids.    a. 0.180M...

Find the pH of each of the following solutions of mixtures of acids.   

a. 0.180M in HCHO2 and 0.22M in HC2H3O2

b. 6.0

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Homework Answers

Answer #1

Formic acid HCHO2            pKa = 3.75             Ka = 1.77.10-4

Acetic acid HC2H3O2      pKa = 4.76               Ka = 1.76.10-5

Hydrocyanic acid               pKa = 9.21              Ka = 6.17.10-10

Theorethical background.

The stronger acid inhibits the dissociation of the weaker one.

In this case, acetic acid is less dissociated in the presence of formic acid. Think to Le Chatelier

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