The molar conductivities of ∧∘NaOAc and ∧∘HCl at infinite dilution in water at 25∘C are 91 and 426.2Scm2mol−1 respectively. To calculate, ∧∘HOAc, the additional value required is_________.
A
∧∘H2O
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B
∧∘KCl
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C
∧∘NaOH
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D
∧∘NaCl
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Solution
The correct option is D∧∘NaCl
→ Molar Conductance of strong electrolytes at infinite dilution can be obtained graphically by extrapolation.
→ This method is not applicable for weak electrolyte.
→ To find molar conductance of weak electrolyte, Kohlrausch's law is applied.
→ To calculate molar conductance of acetic acid at infinite dilution (∧∘HOAc),molar conductance of HCl at infinite dilution(∧∘HCl), Sodium Acetate(∧∘NaOAc) and Sodium Chloride(∧∘NaCl) should be known.