Atomic StructureMedium
Question
Solubility product of silver bromide is 5.0 × 10-13. The quantity of potassium bromide (molar mass taken as 120 g of mol-1) to be added to 1 litre of 0.05 M solution of silver nitrate to start the precipitation of AgBr is
Options
A.1.2 × 10-10 g
B.1.2 × 10-9 g
C.6.2 × 10-5 g
D.5.0 × 10-8 g
Solution
Ag+ + Br- ⇋ AgBr
Precipitation starts when ionic product just exceeds solubility product
Ksp = [Ag+][Br-]
[Br-] =
i.e., precipitation just starts when 10-11 moles of KBr is added to 1L of AgNO3 solution.
No. of moles of KBr to be added = 10-11
∴ weight of KBr to be added = 10-11 × 120
= 1.2 × 10-9g
Precipitation starts when ionic product just exceeds solubility product
Ksp = [Ag+][Br-]
[Br-] =
i.e., precipitation just starts when 10-11 moles of KBr is added to 1L of AgNO3 solution.
No. of moles of KBr to be added = 10-11
∴ weight of KBr to be added = 10-11 × 120
= 1.2 × 10-9g
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