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At 25°C in water, the limiting molar conductivities of sodium acetate (Λ° NaOAc) and hydrochloric acid (Λ° HCl) are 91.0 and 426.2 S cm² mol⁻¹, respectively. To determine the limiting molar conductivity of acetic acid (Λ° H OAc), which additional quantity is needed?

1. Λ° NaOH
2. Λ° NaCl
3. Λ° H2O
4. Λ° KCl

Correct answer: Λ° NaCl

Solution

To determine the limiting molar conductivity of acetic acid, we need to know the conductivity of its ions in solution. Sodium acetate dissociates into sodium ions and acetate ions, while hydrochloric acid dissociates into hydrogen ions and chloride ions. By knowing the limiting molar conductivity of sodium chloride, we can calculate the contribution of the chloride ions, allowing us to isolate the conductivity of acetic acid.

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