# What is the pH of a buffer that consists of 0.100 M HCOOH and 0.540 M HCOONa?

## The $p {K}_{a}$ of formic acid is 3.74.

Apr 21, 2016

$p H$ $>$ $3.74$
$p H = p {K}_{a} + {\log}_{10} \left\{\frac{\left[{A}^{_}\right]}{\left[H A\right]}\right\}$
$p H = 3.74 + {\log}_{10} \left\{\frac{0.540 \cdot m o l \cdot {L}^{-} 1}{0.100 \cdot m o l \cdot {L}^{-} 1}\right\}$