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Ionic Equilibrum question

2016 · Q107
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Ionic Equilibrum question

2016 · Q107

NEETChemistryIonic EquilibrumMCQ+4 / −1
MY and NY3, two nearly insoluble salts, have the same Ksp values of 6.2 ×\times× 10−-−13 at room temperature. Which statement would be true in regard to MY and NY3?
  1. A
    The salts MY and NY3 are more soluble in 0.5 M KY than in pure water.
  2. B
    The addition of the salt of KY to solution of MY and NY3 will have no effect on their solubilities.
  3. C
    The molar solubilities of MY and NY3 in water are identical.
  4. D
    The molar solubility of MY in water is less than that of NY3.
View written solutionFree

Correct answer: D

MY ⇌ M+ + Y–
   s        s       s

Ksp = s.s = s2

⇒\Rightarrow⇒ s = 6.2×10−13\sqrt {6.2 \times {{10}^{ - 13}}} 6.2×10−13​

= 7.87 × 10–7 mol L–1

NY3 ⇌ N+ + 3Y–
   s        s       3s

Ksp = s.(3s)3 = 27s4

6.2 × 10–13 = 27s4

⇒\Rightarrow⇒ s = 3.89 × 10–4 mol L–1

Hence, molar solubility of MY in water is less than that of NY3.

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