What are the uses of buffer solutions?

Jun 6, 2017

Buffers are used to keep the $p H$ of solution tolerably close to a given value..........
$p H = p {K}_{a} + {\log}_{10} \left\{\frac{\left[{A}^{-}\right]}{\left[H A\right]}\right\}$
To keep $p H$ around a certain value we choose an acid whose $p {K}_{a}$ is close to the desired $p H$. Biological systems are extensively buffered.