Question

how does molar condctivity vary with concentration for weak wlectrolyte?​

Answer 1

◻molar conductivity vary with concentration for weak electrolyte⬇⬇⬇⬇

the weak electrolytes dissociate to a much lesser extent as compared to strong electrolytes. Therefore, the molar conductivity is low as compared to strong electrolytes.

However, the variation of /\m with C^½ is very large and so much, so that we cannot obtain molar conductance at infinite dilution (/\m°) by extrapolation of /\m versus C^½ point.

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◻ conductance behaviour of weak electrolytes.⬇⬇⬇⬇⬇⬇⬇

➡ the number of Ions furnished by an electrolyte in solution depends upon the degree of dissociation with dilution. With the increase in dilution, the degree of dissociation increase and as a result molar conductance increase. The limiting value of molar conductance (/\m) corresponds to degree of dissociation equal to I. the whole of the the electrolyte dissociates.

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Thus the degree of dissociation can be calculated at any concentration.⬇⬇

$a = \: /| {m}^{c} / \: /| {m}^{o} \:$

where "a" is the degree of dissociation,

(/\m^c)— is the molar conductance at concentration,

(/\m°)— is the molar conductance at infinite dilution.

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Hope it helps you...⭐⭐⭐

Thank you❇❇❇❇

Answer 2

There is sharp increase in the number of ions in the solution. Hence, the molar conductivity of a weak electrolyte rises steeply at low concentration. ... This decrease is due to the increase in interionic attractions as a result of greater numbr of ions per unit volume.