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The pH of a solution obtained by mixing equal volume of solutions having pH = 3 and pH = 4. [log 5.5 = 0.7404]

Options

  1. A3.26
  2. B3.5
  3. C4.0
  4. D3.42

Correct answer

A. 3.26

Step-by-step solution

At pH = 3 , H + = 1 0 - 3 M At pH = 4 , H + = 1 0 - 4 M When in equal volume of the two solutions are mixed, the H + = 1 0 - 3 + 1 0 - 4 2 = 1 0 - 3 1 + 0.1 2 = 1.1 2 × 1 0 - 3 H + = 5.5 × 1 0 - 4 - log H + = - log 5.5 - log1 0 - 4 pH = - 0 . 74 04 + 4 = 3 . 26

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