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The equivalent conductances of sodium ch...

The equivalent conductances of sodium chloride, hydrochloric acid and sodium acetate at infinite dilution are 126.45, 426.16 and `91.0 ohm^(-1) cm^(2) eq^(-1)`, respectively at `25^(@)C`. Calculate the equivalent conductance of acetic acid at infinite dilution.

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According to Kohlrausch's law,
`Lambda_(oo CH_(3)COONa)=lambda_(CH_(3)COO^(-))+lambda_(Na^(+))=91.0` ...(i)
`Lambda_(oo HCl)=lambda_(H^(+))+lambda_(Cl^(-))=426.16` ...(ii)
`Lambda_(oo NaCl)=lambda_(Na^(+))+lambda_(Cl^(-))=126.45` ...(iii)
Adding eqs. (i) and (ii) and substacting eq. (iii),
`lambda_(CH_(3)COO^(-))+lambda_(Na^(+))+lambda_(H^(+))+lambda_(Cl^(-))-lambda_(Na^(+))-lambda_(Cl^(-))`
`=91.0+426.16-126.45`
`lambda_(CH_(3)COO^(-))+lambda_(H^(+))=Lambda_(oo CH_(3)COOH)=390.7 ohm^(-1) cm^(2) eq^(-1)`
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