Sodium thiosulphate,Na_2S_2O_3 cdot 5H_2O is | vedclass

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(C) In photography,sodium thiosulphate $(Na_2S_2O_3)$ is used as a 'fixing agent'.After the development of the film,the unexposed silver bromide $(AgB

Vedclass · Accepted Answer

remove undecomposed $AgBr$ as soluble silver thiosulphate complex

Vedclass · Answer

(C) In photography,sodium thiosulphate $(Na_2S_2O_3)$ is used as a 'fixing agent'.After the development of the film,the unexposed silver bromide $(AgBr)$ remains on the film.Sodium thiosulphate reacts with this unexposed $AgBr$ to form a soluble complex,sodium dithiosulphatoargentate$(I)$,which can be washed away.The reaction is: $AgBr(s) + 2Na_2S_2O_3(aq) \rightarrow Na_3[Ag(S_2O_3)_2](aq) + NaBr(aq)$.

Sodium thiosulphate,$Na_2S_2O_3 \cdot 5H_2O$ is used in photography to

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