Question

In the precipitation of iron group in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide. It helps in

• A. Keeping the concentration of $O{H}^{–}$ ions low
• B. Preventing the interference by $P{O}_4^{3-}$ ions
• C. Increasing the concentration of $C{l}^{–}$ ions
• D. Increasing the concentration of $N{H}_4^{+}$ ions

Answer 1

The correct option is A Keeping the concentration of $O{H}^{–}$ ions low

$N{H}_{4}Cl$ is added to reduce the dissociation of $N{H}_4^{+}$ ion