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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

What is the minimum p H required to prevent the precipitation of Z n S in a solution that is 0.01 M Z n C l 2 and saturated with 0.10 M H 2 S ? [Given K s p = 1 0 - 21 , K a 1 × K a 2 = 1 0 - 20 ]

Options

  1. A0
  2. B1
  3. C2
  4. D4

Correct answer

B. 1

Step-by-step solution

K s p = Z n 2 + S 2 - K e q = [ H + ] 2 S 2 - H 2 S 1 0 - 21 = 0.01 S 2 - 1 0 - 20 = [ H + ] 2 1 0 - 19 0.1 S 2 - = 1 0 - 19 H + = 1 0 - 1

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