KVPY2010ChemistryIonic Equilibrium
The ubility product of Mg ( OH )₂ is 1.0 10⁻¹² . Concentrated aqueous NaOH ution is added to a 0.01 M aqueous ution of MgCl ₂ . The pH at which precipitation occur is-
Options
- A7.2
- B7.8
- C8.0
- D9.0
Correct answer
D. 9.0
Step-by-step solution
MgCl ₂ Mg ⁺²+2 Cl ⁻ array c ? 0.01 M K _ p = Q = [ Mg ⁺² ] [ OH ⁻ ]² 10⁻¹²=[0.01] [ OH ⁻ ]² [ OH ⁻ ]²=10⁻¹⁰ [ OH ⁻ ]=10⁻⁵ pOH =5 pH =9 array