Question

(ii) The following figure 2, represents variation of (Λm ) vs √c for an

electrolyte. Here Λm is the molar conductivity and c is the

concentration of the electrolyte.

Figure 2

a) Define molar conductivity

b) Identify the nature of electrolyte on the basis of the above plot. Justify your

answer.

c) What happens to molar conductivity of the electrolyte upon dilution?

d) Show how to calculate the value of A for the electrolyte using the above graph
​

Answer 1

Answer:

Molar conductivity of a solution at a given concentration is the conductance

of the volume V of solution containing one mole of electrolyte kept between two

electrodes with area of cross section A and distance of unit length.

(b)Strong electrolyte, For strong electrolytes, Λm increases slowly with dilution

( c) Λm = Λm° – A c ½

Therefore Λm° = 150 S cm2 mol–1

(d)

A = – slope = - (149 – 147.8/ 0.010-0.022) = 100 S cm2 mol–1

/(mol/L–1

)

1/2

.

Answer 2

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