CH-1612
Tests for cations
Chemistry · Secondary 4 · Medium · Tests for cations
Four colourless solutions W, X, Y and Z are tested.
• Adding aqueous sodium hydroxide to W and warming gives a gas that turns damp red litmus paper blue.
• Adding dilute nitric acid followed by aqueous silver nitrate to W gives no visible change.
Which ion is present in W?
• Adding aqueous sodium hydroxide to W and warming gives a gas that turns damp red litmus paper blue.
• Adding dilute nitric acid followed by aqueous silver nitrate to W gives no visible change.
Which ion is present in W?
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