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Ag Br(s) + 2S2O(3(aq) ) ^(2-) hArr Ag (S...

`Ag Br_(s) + 2S_2O_(3(aq) ) ^(2-) hArr Ag (S_2O_3)_(2(aq) ) ^(3-) +Br_(aq) ^(-) `
[Using : ` K_(sp) (AgBr) = 5xx 10 ^(-13) K_(f) (Ag(S_2O_3) _2^(3-) ) =5xx 10^(13) ]`
What is the molar solubility of AgBr in 0.1 M `Na_2S_2O_3`

A

` 0.5 M`

B

` 0.45 M`

C

` 0.045 M`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
Due to high `K_f,` almost `Ag^(+) ` converts in to complex
` {:(AgBr +2S_2 O_3^(-2) hArr, [Ag(S_2O_3)_2]^(3-) ,+Br) ,(0.1M,0,0),((0.1-2x),x,x):}`
` 25= (x^(2))/((0.1-2x) ^(2) ), (x)/(0.1 - 2x) =5rArr x =0.045 M`
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