Question

Select the correct statement about Ostwald's dilution law :

• A. It is valid for weak electrolytes dissociation.
• B. It is useful in calculating ionisation constant of acids or bases.
• C. It is not valid for strong electrolytes.
• D. All of the above

Answer 1

The correct option is D All of the above

According to Ostwald’s dilution law, the degree of dissociation of a weak electrolyte is proportional to the square root of dilution.
$\alpha =\sqrt{\frac{K}{C}}$
where $\alpha$ is degree of dissociation,
$C=$ concentration
$K=$ dissociation or ionisation constant

The Ostwald dilution law is useful for weak electrolyte solutions.
It cannot be used for strong electrolyte solutions.
The ionization constants of acids and bases can be calculated using Ostwald's dilution law.