Qualitative Analysis of Strontium Ion

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⁺ + CO₃^2- → 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⁺ + SO₄^2– → SrSO₄

Flame Test

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