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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 `91.0ohm^(-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)`

Text Solution

Verified by Experts

According to Kohlraush s law,
`Lambda_(ooCH_(3)COONa)=lambda_(CH_(3)COO^(-))+lambda_(Na^(+))=91.0`.....(i)
`Lambda_(ooHCl)=lambda_(H^(+))+lambda_(Cl^(-))=426.16`.....(ii)
`Lambda_(ooNaCl)=lambda_(Na^(+))+lambda_(Cl^(-))=126.45`.....(iii)
Adding eqns. (i) and (ii) and subtracting (iii),
`lambda_(CH3COO^(-))+lambda_(Na^(+))+lambda_(H^(+))+lambda_(Cl^(-))-lambda_(Na^(+))-lambda_(Cl^(-))`
`=91.0+426.16-126.45`
`lambda_(CH3COO^(-))+lambda_(H^(+))=Lambda_(ooCH_(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 91.0 ohm^(-1) cm^(2) eq^(-1) , respectively at 25^(@)C . Calculate the equivalent conductance of acetic acid at infinite dilution.

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)`

  • 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)`

  • The molar conductances 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
    `201.28ohm^(-1)cm^(2)mol^(-1)`
    B
    `390.71ohm^(-1)cm^(2)mol^(-1)`
    C
    `698.28ohm^(-1)cm^(2)mol^(-1)`
    D
    `540.48ohm^(-1)cm^(2)mol^(-1)`

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    The molar conductance of CH_(3)COOHNa HCI and NaCI at infinite dilutions are 91.0, 426.0 and 126.0 ohm^(-1) cm^(-1) respectively. Calculate the molar conductence of acetic acid at infinie dilution.

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