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The following curve is obtained when mol...

The following curve is obtained when molar conductivity , `Lambda_(m)` is plotted against the square root of concentration , `C^(1//2)` along y and x -axis respectively for the two electrolytes X and Y .

How can you determine `Lambda_(m)^(oo)` for these electrolytes ?

Text Solution

Verified by Experts

For `X , Lambda_(m)^(oo)` can be obtained by extrapolation to zero concentration .
For `Y , Lambda_(m)^(oo)` can be calculated by using Kohlrausch law
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The following curve is obtained when molar conductivity (wedge_(m)) is plotted against the square root of concentration, c^(1//2) for two electrolytes A and B (a) How do you account for the increase in the molar conductivity of the electrolyte A on dilution. (b) As seen from the graph, the value of limiting molar conductivity (wedge_(m)^(0)) for electrolyte B cannot be obtained graphically. How can this value be obtained?1

(a) A steady current of 2 amperes was passed through two electrolytic cells X and Y connected in series containing electrolytes FeSO_(4) and ZnSO_(4) until 2.8 g of Fe deposited at the cathode of cell X. How long did the current flow ? Calculate the mass of Zn deposited at the cathode of cell Y (Molar mass : Fe= 56 g mol^(-1) Zn-65.3g mol^(-1) , 1F -96500 C mol^(-1) ) (b) In the plot of molar conductivity (wedge_(m)) vs Square root of concentration (c^(1//2)) , following curves are obtained for two electrolytes. A and B: Answer the following : (i) Predict the nature of electrolytes A and B. (ii) What happens on extrapolation of wedge_(m) to concentration approaching zero for electrolytes A and B ?

Statement: For a weak electrolyte, the plot of molar conductivity (Lambda_(m)) against sqrt(C )(C is concentration in mol litre^(-1)) is nearly linear. Explanation: The molar conductivity at infinite dilution (Lambda_(m)) for an electrolyte can be considered equal to the sum of the limiting molar conductivities of the individual ions.

Molar conductance Lamda_(m) is plotted against sqrt(C) (mol "litre"^(-1) ) for three electrolytes (NaCl, HCl, NH_(4)OH) which of the following is correct ?

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