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Moderate

Concentrations in a Buffer

APCHEM-NZMLUK

A buffer has a pH of 4.85 and contains formic acid and potassium formate.

The $K_a$ of formic acid is $1.8 × 10^{-4}$.

Which of the following can be concluded about the concentrations of the components of the buffer?

A

Formic acid > Potassium formate.

B

Formic acid < Potassium formate.

C

Formic acid = Potassium formate.

D

More information is needed to determine the relative concentrations.