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Crystals of AgBr can be removed from bla...

Crystals of AgBr can be removed from black-and-white photographic film by reacting the AgBr with sodium thiosulphate
`AgBr(s) + 2S_2O_3^(2-) (aq) iff [Ag(S_2O_3)_2]^(3-) (aq) + Br (aq)`
(a) What is the equilibrium constant for this dissolving process?
(b) In order to dissolve 2.5 g of AgBr in a 1-litre solution, how many moles of `Na_2S_2O_3` must be added? `K_(sp) (AgBr) = 5 xx 10^(-13), K_f [Ag (S_2O_3)_2]^(3-) = 2.9 xx 10^13`

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(a) 14.5 (b) 0.03 mole
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