# What is a buffer solution?

Apr 15, 2016

A buffer solution is a mixture of a weak base and its conjugate acid in appreciable quantities. It acts to resist gross changes in $p H$.

#### Explanation:

The buffer equation is simply:

$p H = p {K}_{a} + {\log}_{10} \left\{\frac{\left[{A}^{-}\right]}{\left[H A\right]}\right\}$

When $\left[H A\right] = \left[{A}^{-}\right]$, $p H = p {K}_{a}$. Why?

There should be many answers on these boards that deal with these sorts of problems. You will have to dig for them.