Uses of Salt
| Uses | Examples |
| Agriculture | Ammonium sulphate, (NH4)2SO4; ammonium nitrate, NH4NO3 |
| Chemical | Sodium hypochlorite, NaOCl; tin(II) fluorite, SnF4; silver bromide, AgBr |
| Medical | Potassium manganate(VII); barium sulphate, BaSO4 |
| Food | Sodium benzoate, C6H5COONa; sodium bicarbonate, NaHCO3; monosodium glutamate |
Solubility of Salt
| Salt | Solubility in water |
| Carbonate salts | Insoluble except sodiumcarbonate, potassium carbonate,ammonium carbonate |
| Sodium, potassium and ammonium salts | Soluble |
| Nitrate salts | Soluble |
| Sulphate salts | Soluble except lead(II) sulphate,barium sulphate, calciumsulphate |
| Chloride salts | Soluble except lead(II) chloride,silver chloride, mercury(I) chloride |
Preparation of Salts (Insoluble and Soluble Salts)
Methods and reactions involved in preparation of insoluble salts
- Must able to determine insoluble salts.
- Must through precipitation reaction / double decomposition reaction (interchange of two parts of two substances to form two new substances).
Methods and reactions involved in preparation of soluble salts
- Must able to determine soluble salts.
- Obtain salt crystal from the saturated salt solution through crystallisation (prepare salt solution –> heat –> cool –> salt crystal form).
Methods and reactions involved in preparation of soluble salts (not salts of Na, K and NH4+)
- Reaction between acid + metal oxide –> salt(aq) + water
- Reaction between acid + metal carbonate –> salt(aq) + water + CO2(g)
- Reaction between acid + reactive metal –> salt(aq) + H2(g)
Methods and reactions involved in preparation of soluble salts (Na, K and NH4+)
- Reaction between acid + alkali –> salt(aq) + water
- Must use titration method.
Purification of soluble salts
Impure salt + distilled water –> solution filtered –> filtrate heated –> cool –> crystal obtained.
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