Sodium thiosulphate is used in photography fo | vedclass

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Question

(D) In photography,sodium thiosulphate $(Na_2S_2O_3)$,commonly known as 'hypo',is used as a fixing agent. It dissolves the undecomposed silver bromide

Vedclass · Accepted Answer

To remove undecomposed $AgBr$ in the form of $Na_3[Ag(S_2O_3)_2]$ (a complex salt)

Vedclass · Answer

(D) In photography,sodium thiosulphate $(Na_2S_2O_3)$,commonly known as 'hypo',is used as a fixing agent. It dissolves the undecomposed silver bromide $(AgBr)$ from the photographic film by forming a soluble complex,$Na_3[Ag(S_2O_3)_2]$. The reaction is: $AgBr(s) + 2Na_2S_2O_3(aq) \rightarrow Na_3[Ag(S_2O_3)_2](aq) + NaBr(aq)$.

Sodium thiosulphate is used in photography for which of the following purposes?

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