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The approximate pH of a 0.1 M aqueous H 2 S solution is ( K 1 and K 2 for H 2 S are 1 × 1 0 - 7 and 1.3 × 1 0 - 13 respectively at 25 ° C)

Options

  1. A4
  2. B2
  3. C8
  4. D6

Correct answer

A. 4

Step-by-step solution

Second dissociation of H 2 S is negligible from data H 2 S ⇌ H + + H S - [ H + ] = [ H S - ] = x K 1 = [ H + ] [ H S - ] [ H 2 S ] 1 × 1 0 - 7 = x 2 0.1 So x = 1 0 - 4 p H = - log ⁡ [ H + ] = - log ⁡ 1 0 - 4 = 4 log ⁡ 1 0 = 4 .

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