Tijaabooyin kiimikaad: ions aqueous
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I can perform and interpret sodium hydroxide precipitate tests for metal ions and other tests for identifying ammonium, carbonate, sulfate, and halide ions.
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Some metal ions form coloured precipitates in a reaction with sodium hydroxide solution.
Ammonium ions can be identified by heating with NaOH and using damp red litmus paper, which turns blue if positive.
A dilute acid is usually added before testing for carbonates, sulfates or halides to avoid false positives.
Halide ions produce different coloured precipitates when silver nitrate is added to a solution containing them.
A white precipitate is formed when barium chloride is added to an acidified solution containing sulfate ions.
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