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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Ionic Equilibrium

Olympiad workbook · NSEC · Ionic Equilibrium

If for an aqueous solution of a weak acid, pH=pK_ a +2 at 25^ ^ ^ C...

If for an aqueous solution of a weak acid,

\mathrm{pH}=\mathrm{pK}_{\mathrm{a}}+2

at

25^{{}^{{}^{\circ}}} \mathrm{C}

, the approximate fraction of the acid in the dissociated form is

Options

A $1.1 \%$
B $0.99 \%$
C $99.0 \%$
D $9.9 \%$

Correct answer

C. $99.0 \%$

Step-by-step solution

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