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Write balanced chemical equation for developing a black and white photographic film. Also give reason why the solution of sodium thiosulphate on acidification turns milky white and give balance equation of this reaction

Write balanced chemical equation for developing a black and white photographic film. Also give reason why the solution of sodium thiosulphate on acidification turns milky white and give balance equation of this reaction

Grade:11

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
7 years ago
When a PHOTOGRAPHIC FILM is treated with HYPO,the AgCl on the film reacts with the Na2S2O3 forms a complex Na3[Ag(S2O3)] along with NaBr.
Hence the reaction is AgCl+Na2S2O3——->Na3[Ag(S2O3)]+NaBr.
When HYPO is reacted with SULPHURIC ACID,it forms Sodium Sulphate along with Sulphurdioxide and Sulphur along with water.
Na2S2O3+2H2SO4——->Na2SO4+SO3+S+4H2O

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