Anion Precipitation Test

- Module 8 Chemistry NSW - For multiple ions, type 'and'

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Last updated: October 28, 2025

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Hint	Answer
Step 1	Test with red litmus
Turns blue	OH⁻
	CO₃²⁻
	CH₃COO⁻
	PO₄³⁻
Remains red	SO₄²⁻
	Cl⁻
	Br⁻
	I⁻
Step 2	Add HNO₃
Effervescence/bubbling	CO₃²⁻
Vinegar smell	CH₃COO⁻
Step 2: No observation	Add Ba(NO₃)₂
White precipitate	SO₄²⁻
Step 3: No precipitate	Add AgNO₃
Ag⁺ + Cl⁻ → AgCl(s) what colour is the precipitate?	white
Ag⁺ + Br⁻ → BrCl(s) what colour is the precipitate?	cream/pale yellow
Ag⁺ + l⁻ → Agl(s) what colour is the precipitate?	yellow
No precipitate	Add NH₃ & Ba(NO₃)₂
2Ba²⁺ + 3PO₄³⁻ → Ba₃(PO₄)₂(s) what colour is the precipitate?	white

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