November 27, 2015

Homework Help: Chemi

Posted by Kyubei on Saturday, February 19, 2011 at 3:39pm.

Photographic film contains silver bromide in gelatin. Once exposed, some of the silver bromide decomposes, producing fine grains of silver. The unexposed silver bromide is removed by treating the film with sodium thiosulfate. Soluble sodium silver thiosulfate (Na3Ag(S2O3)2) is produced.
AgBr(s) + 2 Na2S2O3(aq) Na3Ag(S2O3)2(aq) + NaBr(aq)

Determine the mass of Na3Ag(S2O3)2 produced if 0.430 g AgBr is removed.

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