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Question

The molar conductivities of NaOAc and HCl at infinite dilution in water at 25C are 91 and 426.2 S cm2mol1 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.
mHOAc=mHCl+mNaOAcmNaCl


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