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On addition of increasing amount of AgNO...

On addition of increasing amount of `AgNO_(3)`(g) to 0.1 M each of NaCl and NaBr in a solution, what % of `Br^(-)` ion gets precipitated when `Cl^(-)` ion starts precipitating?
Given: `K_(sp)` (AgCl) = `1.0 xx 10^(-10), K_(sp) (AgBr) = 1 xx 10^(-13)`.

Text Solution

Verified by Experts

The correct Answer is:
99.9
`[Ag^(+)]` required for commencement of percipitation of AgCl `=(K_(sp)(AgCl))/([Cl^(-)])= (1.0 xx 10^(-10))/0.1`
`=1.0 xx 10^(-9)` M
`[Br^(-)]` remaining at this stage
% of `Br^(-)` remaining unpredicted
% of `Br^(-)` precipitated =100-0.1 = 99.9
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