Give some common tests used for detection of calcium compounds.

Explanation

The following tests may be performed for the detection of Ca -compounds: (i) Calcium salts give brick-red colour in the flame test. (ii) When ammonium oxalate solution is added to a solution of a calcium salt, a white precipitate of crystalline calcium oxalate is obtained which is insoluble in acetic acid but soluble in mineral acids. (iii) On addition of a solution of sodium carbonate to a neutral ( or amrnoniacal) solution of a Ca-salt, white calcium carbonate is precipitated, which is soluble in acids.