The solubility of silver bromide in hypo solu | vedclass

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Question

Unreacted silver bromide (AgBr) can be dissolved from photographic emulsions using 'hypo'

solution $\left(\mathrm{Na}_{2} \mathrm{S}_{2} \m

Vedclass · Accepted Answer

$[Ag(S_2O_3)_2]^{3-}$

Vedclass · Answer

Unreacted silver bromide (AgBr) can be dissolved from photographic emulsions using 'hypo'

solution $\left(\mathrm{Na}_{2} \mathrm{S}_{2} \mathrm{O}_{3}\right)$ (aq.). The reaction can be represented as:

$\mathrm{AgBr}(\mathrm{s})+3 \mathrm{Na}_{2} \mathrm{S}_{2} \mathrm{O}_{3}(\mathrm{aq}) \rightarrow \mathrm{Na}_{5} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{3}(\mathrm{aq})+\mathrm{NaBr}(\mathrm{aq})$

Hence, option $\mathrm{D}$ is correct.

The solubility of silver bromide in hypo solution is due to the formation of :

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