IGCSE: Acids, bases and salts
Sub Topic: 7.3 Preparation of salts
Syllabus Objectives:
CORE:
- Describe the preparation, separation and purification of soluble salts by reaction of an acid with:
- (a) an alkali by titration
- (b) excess metal
- c) excess insoluble base
- (d) excess insoluble carbonate
- Describe the general solubility rules for salts:
- (a) sodium, potassium and ammonium salts are soluble
- (b) nitrates are soluble
- (c) chlorides are soluble, except lead and silver
- (d) sulfates are soluble, except barium, calcium and lead
- (e) carbonates are insoluble, except sodium, potassium and ammonium
- (f) hydroxides are insoluble, except sodium, potassium, ammonium and calcium (partially)
- Define a hydrated substance as a substance that is chemically combined with water and an anhydrous substance as a substance containing no water
EXTENDED:
- Describe the preparation of insoluble salts by precipitation
- Define the term water of crystallisation as the water molecules present in hydrated crystals, including CuSO4•5H2O and CoCl 2•6H2O
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