Question

Explain that the conductance ratio ^/^° gives degree of dissociation (alpha) for weak

electrolytes but not for KCl or HCl.​

Answer 1

Answer:

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The degree of dissociation of a weak electrolyte is proportional to its molar conductance. ... The second class of compounds, known as weak electrolytes, are those where ionisation is incomplete. The ionisation will increase with dilution and hence the molar conductivity increases with dilution

Answer 2

Conductance ratio gives the degree of dissociation of weak acid and bases because:

• At infinite dilution , there is maximum dissociation of weak acids/bases which constitutes the molar conductivity at infinite dilution $\lambda_{M}^{ \infty}$.

• At higher concentrations , the dissociation of weak acid/base is less which constitute a lower molar conductivity.

• Hence the conductance ratio at infinite dilution and at a particular concentration gives us the dissociation constant of that weak acid/base $(\alpha)$.

But , its not true in case of HCl and KCl , because they are strong electrolytes which can fully dissociate at any given concentration.