# What do buffers do and why are they important in biological systems?

Jun 12, 2016

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

#### Explanation:

AS the equation indicates, the $p H$ of a buffered solution remains tolerably close to the $p {K}_{a}$ of the acid. Biological systems are extensively buffered as a means to prevent gross changes in solution $p H$ (look at the actions of digestive fluid, or the $C {O}_{2}$, $H C {O}_{3}^{-}$ buffer in blood.)

In biological terms, buffer help maintain homeostasis, stability in the face of change.