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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

  1. AThe molar solubilities of MY and N Y 3 in water are identical.
  2. BThe molar solubility of MY in water is less than that of N Y 3 .
  3. CThe salts MY and N Y 3 are more soluble in 0.5 M KY than in pure water.
  4. 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

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