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Activity 2.6 — Metal Oxide + Acid
NCERT Activity 2.6: Add dilute HCl to black copper oxide (CuO). The black powder dissolves and the solution turns blue-green — copper chloride (CuCl₂) has formed. Metal oxide + acid → salt + water.
How To Perform
1
Add Copper Oxide
Put black CuO powder in a beaker.
2
Add Dilute HCl
Pour HCl onto the CuO while stirring.
3
Observe
Black powder dissolves; solution turns blue-green (CuCl₂).
4
Conclude
CuO + 2HCl → CuCl₂ + H₂O. Neutralisation.
⚠️ Safety Notes
- •Wear safety goggles when handling acids.
- •Copper salts are toxic — avoid skin contact and do not ingest.
- •Stir gently to avoid splashing.