- Alkalis react with acids to form a salt and water — this is a neutralisation reaction:
- Alkalis, when warmed with ammonium salts, give off ammonia gas:
Reaction between Alkalis and Acids
Acid + Alkali → Salt + Water
Potassium hydroxide + Nitric Acid → Potassium Nitrate + Water
Alkali heat with Ammonium Salts
Ammonium Salt + Alkali → Salt + Ammonia + Water
Ammonium Chloride + Sodium Hydroxide → Sodium chloride + Water + Ammonia
Ammonia as an Alkali
- By nature, ammonia is a covalent compound.
- Ammonia exists as gas at room temperature.
- Ammonia gas is soluble in water.
- Physical properties of ammonia:
- Pungent smell
- Turn litmus from red to blue