A pinch of NH4Cl is added to original solution. On adding excess of NH4OH to make the solution alkaline then add freshly prepared (NH4)2CO3 solution, a white precipitate is obtained.

Sr2+ + CO32- → SrCO3

Confirmatory Test

White precipitate is soluble in acetic acid.

SrCO3 + 2CH3COOH → Sr(CH3COO)2 + H2O

Add (NH4)2SO4. Formation of white precipitate indicates the presence of Sr2+ ion.

Sr2+ + SO42– → SrSO4

Flame Test

You can also perform flame test. It gives crimson red colour to the flame.