# "A buffer equation contains appreciable quantities of a (i)................" "and its (ii) ..................?"

Jun 16, 2017

$\left(i\right)$ $\text{A weak acid;}$........

#### Explanation:

..........and $\left(i i\right)$ $\text{its conjugate base.}$

$p H = p {K}_{a} + {\log}_{10} \left\{\frac{\left[{A}^{-}\right]}{\left[H A\right]}\right\}$
And as we know, when $\left[{A}^{-}\right] = \left[H A\right]$, $p H = p {K}_{a}$. Do you agree?