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Molar conductivity of an electrolyte is ...

Molar conductivity of an electrolyte is the conductance of all the ions produced by one gram mole of the electrolyte in solution and is denoted as `Lambda_(m)`.
`Lambda_(m)=(kxx1000)/(c )`
Here k is the specific conductance while c is the molar concentration of the electrolyte. The molar conductance of the strong electrolytes at infinite dilution `(Lambda_(m)^(oo))` can be obtained graphically by extrapolation while the same for weak electrolytes cannot be obtained graphically. It can be calculated theoretically with the help of Kohrausch's. Law.
`Lambda_(m(AxBy))^(oo)=xlambda_(m (A^(y+)))^(oo)+ylambda_(m(B^(x)))^(oo)`
Which of the following solution of KCl will have the maximum value of specific conductance ?

A

1.0 N

B

0.1 N

C

`1.0xx10^(-2)" N"`

D

0.5 N.

Text Solution

Verified by Experts

The correct Answer is:
A

(a) Specific conductance (k) is directly proportional to the number of ions per unit volume. 1.0 NKCl will give maximum number of ions in solution.
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Knowledge Check

  • Molar conductivity of an electrolyte is the conductance of all the ions produced by one gram mole of the electrolyte in solution and is denoted as Lambda_(m) . Lambda_(m)=(kxx1000)/(c ) Here k is the specific conductance while c is the molar concentration of the electrolyte. The molar conductance of the strong electrolytes at infinite dilution (Lambda_(m)^(oo)) can be obtained graphically by extrapolation while the same for weak electrolytes cannot be obtained graphically. It can be calculated theoretically with the help of Kohrausch's. Law. Lambda_(m(AxBy))^(oo)=xlambda_(m (A^(y+)))^(oo)+ylambda_(m(B^(x)))^(oo) Equivalent conductance of 1 M methanoic acid solution is 10" ohm"^(-1)cm^(2)" equiv"^(-1) and at infinite dilution it is 200" ohym"^(-1)cm^(2)" equiv"^(-1) . The pH of methanoic acid solution is :

    A
    7
    B
    3.3
    C
    1.3
    D
    6.8.
  • Molar conductivity of an electrolyte is the conductance of all the ions produced by one gram mole of the electrolyte in solution and is denoted as Lambda_(m) . Lambda_(m)=(kxx1000)/(c ) Here k is the specific conductance while c is the molar concentration of the electrolyte. The molar conductance of the strong electrolytes at infinite dilution (Lambda_(m)^(oo)) can be obtained graphically by extrapolation while the same for weak electrolytes cannot be obtained graphically. It can be calculated theoretically with the help of Kohrausch's. Law. Lambda_(m(AxBy))^(oo)=xlambda_(m (A^(y+)))^(oo)+ylambda_(m(B^(x)))^(oo) 48250 C of electricity was required to deposit all the copper present in 0.5 L of CuSO_(4) solution using inert electrodes. The molarity of solution was (Assume volume constant).

    A
    0.50 M
    B
    2.50 M
    C
    0.25 M
    D
    1.0 M
  • The molar conductivity of strong electrolyte

    A
    Increases on dilution slightly
    B
    Does not change on dilution
    C
    Decreases on dilution
    D
    Depends on density of electrolyte itself
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