Chemistry - Ionic Equilibrium Question with Solution | TestHub

Hypo solution is ${\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3$ solution which is used in photography for fixing films \& prints. Photographic emulsions are made of AgBr. After developing, the film is put into hypo solution. This forms soluble complex with $\mathrm{Ag}$. \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}+\mathrm{Ag} \mathrm{Br} \rightarrow \mathrm{Ag}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} \longrightarrow \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3} }{\mathrm{Na}_{5}\left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{3}\right]