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200 mL of 0 . 01 MHCl is mixed with 400 mL of 0 . 01 MH 2 SO 4 . The pH of the mixture is

Options

  1. A1 . 14
  2. B1 . 78
  3. C2 . 34
  4. D3 . 02

Correct answer

B. 1 . 78

Step-by-step solution

pH of a mixture of HCl + H 2 SO 4 has to calculated The number of equivalents of HCl is equal to 0 . 02   equivalents The number of equivalents of H 2 SO 4 given is equal to 0 . 008 equivalents Hydrogen ion concentration of the resultant mixture is equal to H + = 0 . 01 × 200 + 0 . 01 × 2 × 400 600 = 2 + 8 600 = 10 600 = 1 60 pH = - log 1 60 = 1 . 78

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