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The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move freely through a solution) at 25°C are given below: Λ°CH3COONa = 91.0 S cm²/equiv. Λ°HCl = 426.2 S cm²/equiv. What additional information/ quantity one needs to calculate Λ° of an aqueous solution of acetic acid?
- Λ° of chloroacetic acid (ClCH2COOH)
- Λ° of NaCl
- Λ° of CH3COOK
- the limiting equivalent conductance of H⁺ (λ°H⁺)
Correct answer: Λ° of CH3COOK
Solution
To calculate the limiting equivalent conductance of acetic acid, one needs the conductance of its salt, potassium acetate (CH3COOK), because it provides the necessary information about the contribution of the acetate ion and the potassium ion to the overall conductance in solution.
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