Question

Identify the acid which matches the following description:
The acid on mixing with lead nitrate solution produces a white precipitate which is insoluble even on heating.

Answer 1

Dilute Sulphuric acid with Lead nitrate:-

1. When we react dilute Sulphuric acid with lead nitrate, it gives Lead sulphate and nitric acid as its product.
2. This Lead sulphate is a white ppt and it does not dissolve in hot water.
3. Balanced chemical reaction:- $\mathrm{P}\underset{(\mathrm{Lead}\mathrm{nitrate})}{\mathrm{b}{\left({\mathrm{NO}}_3\right)}_2\left(\mathrm{aq}\right)}+\underset{(\mathrm{Dil}.\mathrm{sulphuric}\mathrm{acid})}{{\mathrm{H}}_2{\mathrm{SO}}_4\left(\mathrm{aq}\right)}\to \underset{(\mathrm{Lead}\mathrm{sulphate})}{{\mathrm{PbSO}}_4\left(\downarrow \right)\left(\mathrm{white}\right)}+\underset{(\mathrm{Nitric}\mathrm{acid})}{2{\mathrm{HNO}}_3\left(\mathrm{aq}\right)}$

Hence, the acid on mixing with Lead nitrate solution produces a white precipitate which is insoluble even on heating is dilute sulphuric acid.