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The molar conductance of ammonium hydrox...

The molar conductance of ammonium hydroxide solution of concentration 0.1 M, 0.01M and 0.001 M are 3.6, 11.3 and `34.0 ohm^(-1)cm^(2)mol^(-1)` respectively. Calculate the degree of dissociation of `NH_(4)OH` at these concentrations. Molar conductance at infinite dilution for `Nh_(4)OH` is 271.1 `ohm^(-1)cm^(2)mol^(-1)`.

Text Solution

Verified by Experts

The correct Answer is:
(i) a=1.3% (ii) a=12.5%
`(i) " " alpha=(Lambda_(m)^(c))/(Lambda_(m)^(oo))=((3.6" ohm"^(-1)cm^(2) mol^(-1)))/((271.1" ohm"^(-1) cm^(2)mol^(-1)))=0.013" or "1.3%`
`(ii) " " alpha=(Lambda_(m)^(c))/(Lambda_(m)^(oo))=((34.0" ohm"^(-1)cm^(2) mol^(-1)))/((271.1" ohm"^(-1) cm^(2)mol^(-1)))=0.125" or "12.5%`
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