Can we use ammonium sulphate instead of ammonium chloride in group 3(SALT ANALYSIS)

The sulphates of the alkaline earth metals calcium, strontium, and barium are sparingly soluble or insoluble in water. So, if (NH4)2SO4 is added to the salt solution, the bivalent radical (group 5) of any of these metals will also form a white precipitate of its sulphate, if present.

e.g. Ba(2+) + SO4(2-) = BaSO4(s)

And, this may interfere with the systematic investigation of the salt.

The chlorides of calcium, strontium and barium and most other metals are fairly soluble in water, and so NH4Cl is conveniently used to facilitate the common ion effect.