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The equivalent conductances of two stro...

The equivalent conductances of two strong electrolytes at infinite dilution in `H_(2)O` (where ions move freely through a solution) at `25^(@)C` are given below :
`Lambda_(CH_(3)COONa)^(@) = 91.0 S cm^(2)//"equi v"`.
`Lambda_(HCl)^(@) = 426.2 S cm^(2)//"equiv"`. What additional information//quantity one need to calculate `Lambda^(@)` of an aqueous solution of acetic acid ?

A

`Lambda^(@)` of chloroacetic acid `(CICH_(2)COOH)`

B

`Lambda^(@)NaCl`

C

`Lambda^(@)CH_(3)COOK`

D

T he limiting equivalent conductance of `H^(+)(lambda^(@)H^(+))`

Text Solution

Verified by Experts

The correct Answer is:
B
`^^_(CH_(3)COOH)^(@)=^^_(CH_(3)COONa)^(@)+^^_(HCl)^(@)-^^_(NaCl)^(@)`
`therefore` additional quantity needed is `^^_(NaCl)^(@)`
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Calculate K_(a) of acetic acid it its 0.05N solution has equivalent conductances of 7.36 mho cm^(2) at 25^(@)C (lambda_(CH_(3)COOH)^(oo) = 390.70)

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The molar conductance of acetic acid at infinite dilution if Lambda^@ for CH_3 COONa,NACI and HCI are 91.0, 126.5 and 426.2 S cm^2 "mol"^(-1) respectively is :

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