# Do buffers resist pH change? If so, why?

Aug 27, 2017

They do indeed resist gross changes in $p H$....up to the capacity of the buffer.

#### Explanation:

You have to know.....

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

What is the $p H$ at half-equivalence, when $\left[{A}^{-}\right] = \left[H A\right]$?