CH-1624
Tests for cations
Chemistry · Secondary 4 · Medium · Tests for cations
A student tests for barium ions in a solid suspected to contain . She adds dilute nitric acid to a sample until it stops fizzing, then adds excess aqueous sodium sulfate. Which observation shows that barium ions are present?
- Effervescence is observed when nitric acid is added.
- A colourless gas turns damp red litmus paper blue.
- A white precipitate forms when sodium sulfate is added.
- A colourless solution turns purple when sodium sulfate is added.
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