Na_2S_2O_3 cdot 5H_2O is used in photography | vedclass

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(C) In photography,$Na_2S_2O_3 \cdot 5H_2O$ (sodium thiosulfate),commonly known as hypo,is used as a fixing agent. It reacts with the undecomposed sil

Vedclass · Accepted Answer

Remove undecomposed $AgBr$ as a soluble complex

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(C) In photography,$Na_2S_2O_3 \cdot 5H_2O$ (sodium thiosulfate),commonly known as hypo,is used as a fixing agent. It reacts with the undecomposed silver bromide $(AgBr)$ on the photographic film to form a water-soluble complex,sodium dithiosulfatoargentate$(I)$,which can be washed away. The chemical reaction is: $AgBr(s) + 2Na_2S_2O_3(aq) \rightarrow Na_3[Ag(S_2O_3)_2](aq) + NaBr(aq)$.

$Na_2S_2O_3 \cdot 5H_2O$ is used in photography to

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