NEET2016ChemistryIonic EquilibriumActual
MY and N Y 3 , two nearly insoluble salts, have the same K s p values of 6.2 × 10 - 13 at room temperature. Which statement would be true in regard to MY and N Y 3 ?
Options
- AThe molar solubilities of MY and N Y 3 in water are identical.
- BThe molar solubility of MY in water is less than that of N Y 3 .
- CThe salts MY and N Y 3 are more soluble in 0.5 M KY than in pure water.
- DThe addition of the salt of KY to solution of MY and N Y 3 will have no effect on their solubilities.
Correct answer
B. The molar solubility of MY in water is less than that of N Y 3 .
Step-by-step solution
MY insoluble salt K s p = s 2 N Y 3 salt K s p = s ( 3 s ) 3 = 27 s 4 S = ( k s p 27 ) 1 n S N Y 3 = ( K s p 27 ) 1 4 = ( 6.2 × 10 − 13 27 ) 1 4 ∴ S M Y = 6.2 × 10 - 13 = 7.8 × 10 - 7 Solubility values ∴ S M Y < S N Y 3