COMEDK2018ChemistryIonic Equilibrium
Solubility product of a salt A B is 1 10⁻⁸ M ² in a solution in which the concentration of A⁺ ions is 10⁻³ M . The salt will precipitate when the concentration of B⁻ ions is kept
Options
- Abetween 10⁻⁸ M to 10⁻⁷ M
- Bbetween 10⁻⁷ M to 10⁻⁶ M
- C>10⁻⁵ M
- D< 10⁻⁸ M
Correct answer
C. >10⁻⁵ M
Step-by-step solution
aligned K_ sp &=10⁻⁸ M ² K_ sp &= [A⁺ ] [B⁻ ] 10⁻⁸ &= (10⁻³ ) [B⁻ ] [B⁻ ] &=10⁻⁵ M aligned Salt will precipitate, when concentration of [B⁻ ]>10⁻⁵ M .