Key Points
Key Points: Identifying Substances by Colour, Smell, State & Heat Effect
- Blue/green salts may indicate Cu²⁺, Fe²⁺, or Fe³⁺ ions.
- White salts can suggest Pb²⁺, Zn²⁺, Ca²⁺, Na⁺, K⁺, or NH₄⁺ ions.
- Ammonia smell suggests NH₄⁺, H₂S smell indicates sulphides, and SO₂ smell indicates sulphites.
- Amorphous salts may indicate carbonates (CO₃²⁻).
- Hygroscopic/deliquescent salts point to Cl⁻ or NO₃⁻ ions.
