Question

In the analysis of III group basic radicals of salts, the purpose of adding NH₄Cl (solid) to NH₄OH is:

• A. to increase the concentration of OH⁻ ions
• B. to precipitate the radicals of group IV and V
• C. to suppress the dissociation of NH₄OH
• D. to introduce Cl⁻ ions

Hint:

NH₄Cl suppresses NH₄OH dissociation via the common ion effect, controlling OH⁻ concentration for selective group III radical precipitation.

Answer 1

The Correct Option is C

The addition of NH₄Cl to NH₄OH suppresses the dissociation of NH₄OH due to the common ion effect. This helps in controlling the concentration of OH⁻ ions, ensuring selective precipitation of group III radicals.