The solubility of silver bromide in hypo solution involves the...

The solubility of silver bromide in hypo solution involves the formation of:

Options

A $\mathrm{Ag}_{2} \mathrm{SO}_{3}$
B $\mathrm{Ag}_{2} \mathrm{ S}_{2} \mathrm{O}_{3}$
C $\mathrm{Ag}^{+}$
D $\mathrm{NH}_{4}{ }^{+}$

Correct answer

B. $\mathrm{Ag}_{2} \mathrm{ S}_{2} \mathrm{O}_{3}$

Step-by-step solution

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} \m

mathrm{O}_{3}}{\mathrm{Na}_{5} \left[\mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{3}\right]

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