Question

What is the PH of a buffer solution containing 0.2moldm^-3 ethanoic acid and 0.5moldm^-3 sodium ethanoate?Ka=1.75×10^-5 moldm^-3

Answer 1

.

$PH=-log1.75×10^{-5}+log[\frac{0.2×10^{-3}}{0.5×10^{-3}}]$

$PH=4.757-0.398=4.359$