A confirmatory test of sodium hydroxide and potassium chromate can be used to distinguish between a solution of calcium ion and barium ion.
The test for cations can be used to distinguish calcium ion from barium ion.
- Calcium ion (Ca²⁺) forms a white precipitate with a drop of sodium hydroxide which is insoluble in excess.
- Barium ion (Ba²⁺) forms a yellow precipitate with potassium chromate.
Thus, a confirmatory test of sodium hydroxide and potassium chromate can be used to distinguish between a solution of calcium ion and barium ion.
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