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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.

Text Solution

Verified by Experts

The correct Answer is:
390.7
According to Kohlrausch.s law,
`wedge_(eq(CH_(3)COONa))^(@) = lambda_(CH_(3)COO^(-)) + lambda_(Na^(+)) =91.0`…….(i)
`wedge_(eqHCl)^(@) = lambda_(H^(+)) + lambda_(Cl^(-)) = 426.16`……(ii)
`wedge_(eq NaCl)^(@) = lambda_(Na^(+)) + lambda_(Cl^(-)) = 126.45`.........(iii)
Adding equation (i) and (ii) and substracting (iii),
`lambda_(CH_(3)COO^(-)) + lambda_(H^(+)) = wedge_(eq CH_(3)COOH)^(@) = 390.7 ohm^&(-1) cm^(2) "equiv"^(-1)`
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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) equiv^(-1) , respectively, at 25^(@)C . Calculate the equivalent conductance of acetic acid at infinite dilution.

The equivalent conductances of sodium chloride, hydrochloric acid and sodium acetate at infinite dilution are 126.45, 426.16 and 91.0ohm^(-1) cm^(-1)"equiv"^(-1) , respectively, at 25^(@)C . Calculate the equivalent conducatance of acetic acid at infinite dilution. Lambda_(m)^(0)(HCl)="426.16 S cm"^(2)mol^(-1) Lambda_(m)^(0)(NaCl)="126.45 S cm"^(2)mol^(-1) Lambda_(m)^(0)(CH_(3)COONa)="91 S cm"^(2)mol^(-1)

Knowledge Check

  • Equivalent conductances of NaCl, HCl and CH_(3)COONa at infinite dilution are 126.45, 426.16 and 91 ohm^(-1) cm^(2) eq^(-1) respectively. The equivalent conductance of CH_(3)COOH at infinite dilution would be :

    A
    `101.38 ohm^(-1) cm^(2) eq^(-1)`
    B
    `253.62 ohm^(-1) cm^(2) eq^(-1)`
    C
    `390.71 ohm^(-1) cm^(2) eq^(-1)`
    D
    `678.90 ohm^(-1) cm^(2) eq^(-1)`

  • At certain temperature and infinite dilution , the equivalent conductances of sodium benzoate , hydrochloric acid , and sodium chloride are 240 , 349 and 229 Omega^(-1) cm^(2) eq^(-1) respectively . The equivalent conductance of benzoic acid in Omega^(-1) cm^(2) eq^(-1) at the same condition is

    A
    80
    B
    328
    C
    360
    D
    408

  • The molar conductance of NaCl, HCl and CH_(3)COONa at infinite dilution are 126.45, 426.16 and 91 ohm^(-1) cm^(2) mol^(-1) respectively. The molar conductance of CH_(3)COOH at infinite dilution is :

    A
    `201.28 ohm^(-1) cm^(2) mol^(-1)`
    B
    `390.71 ohm^(-1) cm^(2) mol^(-1)`
    C
    `698.28 ohm^(-1) cm^(2) mol^(-1)`
    D
    `540.48 ohm^(-1) cm^(2) mol^(-1)`

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