In qualitative analysis `NH_4 Cl` is added before `NH_4 OH`

In the precipitation of iron group in qualitative analysis, NH_4Cl is added before the addition of NH_4OH :

In the detection of group III cations (eq. Al^(3+) ) in the qualitative analysis of salts, NH_(4)Cl is added before adding NH_(4)OH . This is meant

In the precipitation of group III in qualitative analysis ammonium chloride is added before adding NH_4OH to :

During the precipitation fof third group of qualitative analysis ammonium chloride is added before adding ammonium hydroxide. The function of NH_4CI is to

In salt analysis. Explain why NH_4Cl is added before the addition of NH_4OH in group III.