Ionic EquilibriumHard
Question
A solution is a mixture of 0.05 M KCI and 0.05 M NaI. The concentration of I- in the solution when AgCI just starts to precipitate is equal to: (KSPAgCI = 10-10 M2 ; KSPAgI = 4 × 10-16 M2)
Options
A.4 × 10-6 M
B.2 × 10-8 M
C.2 × 10-7 M
D.8 × 10-15 M
Solution
For AgCI precipitation [Ag+] = 
= 2 × 10-9
For AgI precipitation [Ag+] =
= 8 × 10-15
Thus AgI will precipitate first. AgCI will precipitate only when,
[Ag+] = 2 × 10-9; Thus [I-]Left =
= 2 × 10-7 M
= 2 × 10-9 For AgI precipitation [Ag+] =
= 8 × 10-15Thus AgI will precipitate first. AgCI will precipitate only when,
[Ag+] = 2 × 10-9; Thus [I-]Left =
= 2 × 10-7 M Create a free account to view solution
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