CH-1619
Tests for cations
Chemistry · Secondary 4 · Medium · Tests for cations
A student tests an unknown solution W.
• When aqueous sodium hydroxide is added and the mixture is warmed, a colourless gas is produced that turns damp red litmus paper blue.
• When dilute nitric acid is added followed by aqueous barium nitrate, a white precipitate forms.
Which ions are present in W?
• When aqueous sodium hydroxide is added and the mixture is warmed, a colourless gas is produced that turns damp red litmus paper blue.
• When dilute nitric acid is added followed by aqueous barium nitrate, a white precipitate forms.
Which ions are present in W?
- ammonium ions and sulfate ions
- ammonium ions and chloride ions
- copper(II) ions and sulfate ions
- sodium ions and carbonate ions
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