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JEE Main201912 Apr 2019Evening ShiftChemistryIonic EquilibriumActual

The molar solubility of C d O H 2 is 1.84 × 10 - 5 M in water. The expectes solunility of C d O H 2 in a buffer solution of p H = 12 is:

Options

  1. A2.49 × 10 - 10 M
  2. B2.49 1.84 × 10 - 9 M
  3. C1.84 × 10 - 9 M
  4. D6.23 × 10 - 11 M

Correct answer

A. 2.49 × 10 - 10 M

Step-by-step solution

K s p = 4 s 3 = 4 × 1.84 × 10 - 5 3 C d S ' O H 2 ⇌ C d + 2 S ' + 2 O H - 10 - 2 + S ' ≃ 10 - 2 S ' × 10 - 2 2 = 4 × 1.84 × 10 - 5 3 S ' = 4 × 1.84 3 × 10 - 11 ( S ' ) = 2.491 × 10 - 10 M

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