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0.2 g sample of benzoic acid, C 6 H 5 C O O H is titrated with 0.12 M Ba O H 2 solution. What volume of B a ( O H ) 2 solution is required to reach the equivalence point? Molar mass of benzoic acid is 122 g m o l - 1 .

Options

  1. A6.83 mL
  2. B13.6 mL
  3. C17.6 mL
  4. D35.2 mL

Correct answer

A. 6.83 mL

Step-by-step solution

Number of moles of benzoic acid = 0.2 122 = 1.64 × 1 0 - 3 Neutralization takes place as 2 C 6 H 5 C O O H + B a ( O H ) 2 → ( C 6 H 5 C O O ) 2 B a + 2 H 2 O Number of moles of B a ( O H ) 2 required = 1 2 × 1.64 × 1 0 - 3 M V 1000 = 1 2 × 1.64 × 1 0 - 3 0.12 × V 1000 = 1 2 × 1.64 × 1 0 - 3 V = 6.83 mL

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