Question

Why aqueous solution of NH4OH + NH4Cl can not be used as buffer solution?

Answer 1

$<p style="color:cyan;font-family:cursive;background :black;font-size:25px;">.While the NH4OH is weak base it does not ionises completely. Thus due to presence of common ion NH4 + in NH4Cl, it supresses the ionisation of weak base NH4OH in order to decrease the OH- concentration so that higher group cations will not get precipitated.</p>$