JEE Main Chemistry question
The pH at which Mg(OH)₂ begins to precipitate from a solution containing 0.10 M Mg²⁺ ions [Ksp of Mg(OH)₂=1×10⁻¹¹] is:
Answer: (B)
Solution
[OH⁻]=√(Ksp/[Mg²⁺])=√(10⁻¹⁰)=10⁻⁵; pOH=5; pH=9.
The pH at which Mg(OH)₂ begins to precipitate from a solution containing 0.10 M Mg²⁺ ions [Ksp of Mg(OH)₂=1×10⁻¹¹] is:
[OH⁻]=√(Ksp/[Mg²⁺])=√(10⁻¹⁰)=10⁻⁵; pOH=5; pH=9.