Salt

• A salt is a compound that is formed when the hydrogen of an atom in an acid is replaced by a metal.

• It is formed by the neutralisation reaction between an acid and a base

• Precipitation

• Titration

Reactions

1. Metal and acid➡️ salt and water

• zinc + sulphuric acid➡️ zinc sulphate+ Hydrogen

2. Metal oxide + acid ➡️ salt and water

• Copper(II) oxide + sulphuric acid➡️ copper sulphate+ water

3• Metal hydroxide + acid ➡️salt and water

• Potassium hydroxide+ hydrochloric acid ➡️ potassium chloride + water

4• Metal carbonate + acid ➡️salt+water+ carbon dioxide

• Zinc carbonate+ nitric acid ➡️ zinc nitrate +water+ carbon dioxide

Solubility

Preparation of soluble salts

1. Metal and acid

2. Metal oxide and acid

3. Metal hydroxide and acid(titration)

4. Metal carbonate and acid

Preparation of insoluble salts

• Precipitation

• Soluble salt+ soluble salt ➡️ insoluble salt

Identification of ions

• Cations (postive ions) they travel to the negative terminal Cathode during electrolysis.

• Anions (negative ions) they travel to the positive terminal Anode during electrolysis

Identification of gases