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Λ° m for NaCl, HCl and NaAc are 126.4, 425.9 and 91.0 S cm2 mol-1 respectively. Calculate Λ° m for HAc.

Options

  1. A126.4 S cm² mol⁻¹
  2. B425.9 S cm² mol⁻¹
  3. C91.0 S cm² mol⁻¹
  4. D390.5 S cm² mol⁻¹

Correct answer

D. 390.5 S cm² mol⁻¹

Step-by-step solution

Λ° m (HAc) = λ° (H+) + λ° (Ac)- = λ° (H+) + λ° (Cl-) + λ° (Ac-) + λ° (Na +) - λ° (Cl-) - λ° (Na+)= Λ° m (HCl) + Λ° m (NaAc) - Λ° m (NaCl) = (425.9 + 91.0 – 126.4 ) S cm2 mol -1= 390.5 S cm² mol⁻¹

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