In the third group of qualitative analysis, the precipitating reagent is NH4OH/NH4OH. The function of NH4Cl is to

Question

In the third group of qualitative analysis, the precipitating reagent is NH4OH/NH4OH. The function of NH4Cl is to (A) increase the ionisation of NH4OH (B) supress the ionisation of NH4OH (C) convert the ions of group third into their respective chlorides (D) stabilise the hydroxides of group third cations

Tardigrade Admin · Accepted Answer

Common ion effect is observed when a solution of weak electrolyte is mixed with a solution of a strong electrolyte, which provides an ion common to that provided by a weak electrolyte.
The

N H_{4} O H

is weak base it does not ionises completely. Thus due to presence of common ion

N H_{4}^{+}

in

N H_{4} Cl

, it suppresses the ionisation of weak base

N H_{4} O H

in order to decrease the

O H^{-}

concentration so that higher group cations will not get precipitated.
Thus the pair

N H_{4} O H + N H_{4} Cl

shows common ion effect.
Ammonium chloride suppresses the ionization of ammonium hydroxide.

Q. In the third group of qualitative analysis, the precipitating reagent is $N H_{4} O H / N H_{4} O H$ . The function of $N H_{4} Cl$ is to

increase the ionisation of $N H_{4} O H$

supress the ionisation of $N H_{4} O H$

convert the ions of group third into their respective chlorides

stabilise the hydroxides of group third cations

Q. In the third group of qualitative analysis, the precipitating reagent is NH4​OH/NH4​OH. The function of NH4​Cl is to

increase the ionisation of NH4​OH

supress the ionisation of NH4​OH

convert the ions of group third into their respective chlorides

stabilise the hydroxides of group third cations

Q. In the third group of qualitative analysis, the precipitating reagent is $N H_{4} O H / N H_{4} O H$ . The function of $N H_{4} Cl$ is to

increase the ionisation of $N H_{4} O H$

supress the ionisation of $N H_{4} O H$