Q.

A solution is a mixture of 0.05 M NaCI and 0.08 M NaI. The concentration of iodide ion in the solution when AgCl just starts precipitating is equal toKsp(AgCl)=1×10−10M2;Ksp(AgI)=4×10−16M2

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a

4×10−6M

b

2×10−8M

c

2×10−7M

d

8×10−15M

answer is C.

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Detailed Solution

Ksp  (AgCl) Ksp  (AgI) hence, AgI is precipitated before AgCl. [ Ag+] to precipitated  Cl−=1×10−100.05=2×10−9MI−at this stage =Ksp(AgI)Ag+=4×10−162×10−9=2×10−7M
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