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Question: On addition of increasing amount of AgNO<sub>3</sub> to 0.1(M) each of NaCl and NaBr in a solution, ...

On addition of increasing amount of AgNO3 to 0.1(M) each of NaCl and NaBr in a solution, what % of Br– ions gets precipitated when Cl– ions start precipitating ?

Ksp of AgCl = 10–10 and Ksp of AgBr = 10–13

A

0.1

B

0.01

C

99.9

D

99.99

Answer

99.9

Explanation

Solution

When Cl– ion start precipitating,

[Ag+] = 10–9(M)

& [Br–] = 10−1310−9\frac{10^{- 13}}{10^{- 9}} = 10–4(M)

\ % of Br– precipitated = 0.1–0.00010.1\frac{0.1–0.0001}{0.1} × 100

= 99.9%