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Na2S2O3 does react with AgNO3, it is a reaction widely used in non-digital Photography. The reaction is:

2AgNO3 + Na2S2O3 = Ag2S2o3 + 2 NaNo3

If hypo is taken in a limited amount, then this happens. The Ag thiosulphate thus formed goes through a change of colour (termed as 'play of colour').

Ag2S2O3 (white) --> yellow --> orange --> brown --> black (AgS ppt).

But if hypo is taken in excess amount, then a complex [Ag(S2O3)2]3- , it is readily dissolved in water.

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