Question

A white product having the odour of chlorine is used to remove the yellowness of white clothes in laundries. Name this product. How is it prepared? Write the chemical equation for the reaction involved in its preparation.

Answer 1

1. Bleaching powder: It is used used to remove the yellowness of white clothes in laundries.
2. Chemical name of bleaching powder: Calcium Oxychloride (${\mathrm{CaOCl}}_2$).
3. Preparation of Calcium Oxychloride (${\mathrm{CaOCl}}_2$): The action of chlorine (${\mathrm{Cl}}_2$) gas on dry slaked lime (Calcium hydroxide) produces bleaching powder.

$$\begin{gathered} \mathrm{Ca}{\left(\mathrm{OH}\right)}_2\left(\mathrm{s}\right)+{\mathrm{Cl}}_2\left(\mathrm{g}\right)\to {\mathrm{CaOCl}}_2\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \mathrm{Calcium}\mathrm{Chlorine}\mathrm{Bleaching}\mathrm{Water} \\ \mathrm{hydroxide}\mathrm{powder} \end{gathered}$$