The equivalent conductance at infinite dilution of a weak acid such as `HF`

Options

A. can be determined by extrapolation of measurement on dilute solutions of HCl, HBr and Hi
B. can be determined by measurement on very dilute HF solutions
C. can best be determined from measurement on dilute solutions of Naf, NaCl and HCl
D. is an undefined quantity

Answer

C

Explanation

By Kohlrausch law, if the values of
`Lambda_(NaF)^(@),Lambda_(NaCl)^(@)` and `Lambda_(HCl)^(@)` are known, then `Lambda_(HF)^(@)` can be determined by
`Lambda_(HF)^(@)=Lambda_(HCl)^(@)+Lambda_(NaF)^(@)-Lambda_(NaCl)^(@)`