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State and explain Kohlrausch's law. How ...

State and explain Kohlrausch's law. How does it help in the calculation of `^^_(m)^(@)` for a weak electrolyte, `CH_(3)COOH`?

Text Solution

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Kohlrausch.s law. It states that at infinite dilution, the molar conductance of an electrolyte is equal to the sum of the molar conductances of its ions with molar conductance of each ion multiplied with the number of ions present in the formula of the electrolyte.
e.g., `^^_(m)^(oo)(CH_(3)COOH)`
`=lamda_(m)^(oo)(H^(+))+lamda_(m)^(oo)(CH_(3)COO^(-))`
`^^_(m)^(oo)(NH_(4)OH)=lamda_(m)^(oo)(NH_(4)^(+))+lamda_(m)^(oo)(OH^(-))`
Degree of dissociation of weak electrolyte,
`alpha=(^^_(m)^(c))/(^^_(m)^(oo))`
and `^^_(m)^(oo)(CH_(3)COOH)`
`=^^_(m)^(oo)(CH_(3)COONa)+^^_(m)^(oo)(HCl)-^^_(m)^(oo)(NaCl)`
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Knowledge Check

  • The questions consist of two atatements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses : Molar conductiveiy of a weak electrolyte at infinite dilution cannot be determined experimentally . Kohlrausch's low help to find the molar conductiveiy of a weak electrolyte at infinite dilution.

    A
    If both the assertion and reason are true but the reason is ont the correct explanation of assertion
    B
    If both the assertion and reason are true but the reason is not the correct explanation of assertion.
    C
    If the assertion is true but reason is false.
    D
    If assertion is false but reason is rue

  • Statement-1: Molar conductivity of a weak electrolyte at inifinite dilution cannot be dtermined experimentally. Statement-2: Kohlrausch law helps to find the molar conductivity of a weak electrolyte at infinite dilution.

    A
    Statement-1 is True, Statement-2 is True : Statement-2 is a correct explanation for Statement-9
    B
    Statement-1 is True, Statement-2 is True : Statement-2 is `NOT` a correct explanation for Statement-9
    C
    Statement-1 is True, Statement-2 is False.
    D
    Statement-1 is False, Statement-2 is True.

  • Assertion: Molar conductivity of a weak electrolyte at infinite dilution cannot be determined experimentally. Reason: Kohlrausch law helps to find molar conductivity of a weak electrolyte at infinite dilution.

    A
    If both assertion and reason are true, and reason is the true explanation of the assertion
    B
    if both assertion and reason are true, but reason is not the true explanation of the assertion.
    C
    if assertion is true, but reason is false.
    D
    If both assertion and reason are false.

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