AP EAMCET202017 Sep 2020Evening ShiftChemistryIonic EquilibriumActual
When equal volumes of ( Ca ²⁺ ) and ( F ⁻ )solutions are mixed, in which of the solutions precipitation will not occur? ( (K_ sp . ) of ( . CaF ₂=1.6 10⁻¹⁰ ) )
Options
- A(10²⁻ MCa ²⁺+10⁵⁻ MF ⁻ )
- B(10³⁻ MCa ²⁺+10³⁻ MF ⁻ )
- C(10⁴⁻ M Ca ²⁺+10²⁻ M F ⁻ )
- D(10²⁻ MCa ²⁺+10³⁻ M F ⁻ )
Correct answer
A. (10²⁻ MCa ²⁺+10⁵⁻ MF ⁻ )
Step-by-step solution
At a given temperature, when ionic product ( (K_ ip ) ) over comes solubility product ( (K_ sp ) ), precipitation of the sparingly soluble electrolyte (here, it is ( CaF ₂ ) ) takes place. ( aligned K_ ip & = [ Ca ²⁺ ] [ F ⁻ ]^2= (10⁻² ) (10⁻⁵ )^2=10⁻¹² < K_ sp & =1.6 10⁻¹⁰ aligned ) So, at this condition ( (10⁻² M Ca ²⁺+10⁻⁵ M F ⁻ ) ), precipitation of ( CaF ₂ ) will not occur.