Which salt from following forms aqueous solution having $\mathrm{pH}$ less than 7 ?
Which salt from following forms aqueous solution having $\mathrm{pH}$ less than 7 ?
$CH_3COONa$
$Na_2SO_4$
$CuSO_4$
$Na_2CO_3$
Solution
A salt of strong acid and weak base forms aqueous solution having $\mathrm{pH}$ less than 7 (that is, it forms an acidic solution). $\mathrm{CuSO}_4$ is salt of strong acid $\mathrm{H}_2 \mathrm{SO}_4$ and weak base $\mathrm{Cu}(\mathrm{OH})_2$.