Cambridge IGCSE Chemistry
7.3Preparation of salts
Preparation of salts in Cambridge IGCSE Chemistry: what the syllabus expects you to know, the learning objectives and how to practise.
Subtopic61 practice questions3 lessons
Learning objectives
What the syllabus expects you to be able to do.
- 7.3.1Describe how to prepare, separate and purify a soluble salt by reacting an acid with an alkali (by titration), or with an excess of a metal, an insoluble base or an insoluble carbonate.
- 7.3.2Describe the general solubility rules for salts: sodium, potassium and ammonium salts and all nitrates are soluble; chlorides are soluble except those of lead and silver; sulfates are soluble except those of barium, calcium and lead; carbonates are insoluble except those of sodium, potassium and ammonium; hydroxides are insoluble except those of sodium, potassium and ammonium, with calcium hydroxide partially soluble.
- 7.3.3Define a hydrated substance as one that is chemically combined with water and an anhydrous substance as one that contains no water.
- 7.3.4Supplement: describe how an insoluble salt is prepared by precipitation.
- 7.3.5Supplement: define water of crystallisation as the water molecules present in hydrated crystals, such as CuSO₄·5H₂O and CoCl₂·6H₂O.
Lessons
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Hydrated salts and water of crystallisation
30 min
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Preparing soluble salts
30 min
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Solubility rules and preparing insoluble salts
25 min
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Sample question
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