Ionic EquilibriumHard
Question
The precipitate of CaF2 (Ksp = 1.7 × 10-10) is obtained, when equal volumes of the following are mixed :
Options
A.10-10 M Ca2+ + 10-4MF-
B.10-2 M Ca2+ + 10-3MF-
C.10-5 M Ca2+ + 10-3MF-
D.10-3 M Ca2+ + 10-5MF-
Solution
Precipitation will be started when Ionic product > solubility product i, e, when
[Ca2+][F-]2 > Ksp
When equal volumes of 10-2 MCa2+ and 10-3MF- solutions are mixed then
Ionic product =
= 1.25 × 10-9
It exceeds Ksp (1.7 × 10-9), thus precipitation will be started.
For all other cases, Ionic product < Ksp
[Ca2+][F-]2 > Ksp
When equal volumes of 10-2 MCa2+ and 10-3MF- solutions are mixed then
Ionic product =
= 1.25 × 10-9
It exceeds Ksp (1.7 × 10-9), thus precipitation will be started.
For all other cases, Ionic product < Ksp
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