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NEET2015ChemistryIonic EquilibriumActual

What is the pH of the resulting solution when equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed?

Options

  1. A12.65
  2. B2.0
  3. C7.0
  4. D1.04

Correct answer

A. 12.65

Step-by-step solution

N 1 V 1 - N 2 V 2 = N . V . 0.1 × 1 - 0.01 × 1 = N × 2 O H - = N net = 0 . 09 2 = 0.045   N p O H = - l o g   0.045 = 1.35 ∴ p H = 14 - p O H = 14 - 1.35 = 12.65

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