Question

The degree of dissociation of an electrolyte

Answer 1

Answer:

Compounds that completely dissociate is characterized by α>30% and is called strong electrolytes. If the degree of dissociation is α<3% than electrolyte is called weak electrolyte. Electrolyte characterized by 3<α<30% is medium electrolyte.

Answer 2

Answer:

You know that the molar conductivity of any solution is inversely proportional to square root of concentration for weak electrolytes. i.e.

Λcm ∝1c√

Also, the degree of dissociation is directly proportional to the molar conductivity of the solution as:

α = ΛcmΛom⇒α ∝ Λcm⇒α ∝ 1c√

where symbols have their usual meanings.

Now, if you increase the dilution, it means you are decreasing the concentration 'c', and thereby increasing the value of 1c√

And, degree of dissociation is directly proportional to 1c√

Thus, degree of dissociation is directly proportional the dilution for weak electrolytes. Hence, on increasing the dilution of any weak electrolyte, its degree o dissociation will also increase.

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