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Cambridge IGCSE Chemistry practice

Paper 3 structured question: Preparation of salts

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Preparation of salts

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Paper 3Theory (Core)4 marks

Understanding the solubility of salts is essential for predicting chemical reactions.

Description

Solubility of Salts

Different salts have varying solubility in water. Sodium, potassium, and ammonium salts are soluble. Nitrates are soluble. Chlorides are soluble except for lead and silver. Sulfates are soluble except for barium, calcium, and lead. Carbonates are generally insoluble except for sodium, potassium, and ammonium. Hydroxides are generally insoluble except for sodium, potassium, ammonium, and partially calcium.

  1. a

    Outline Describe the solubility of carbonates and provide exceptions.

    Aim for approximately 2 distinct marking points.

    [2]
  2. b

    Describe Explain the solubility of hydroxides and mention any exceptions.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 3 structured question: Preparation of salts

Paper 3Theory (Core)1 marks

Description

Solubility Rules

The solubility of different salts varies. Sodium, potassium, and ammonium salts are soluble. Nitrates are soluble. Chlorides are soluble except for lead and silver. Sulfates are soluble except for barium, calcium, and lead. Carbonates are insoluble except for sodium, potassium, and ammonium. Hydroxides are insoluble except for sodium, potassium, ammonium, and partially calcium.

  1. a

    State List the exceptions to the solubility of chlorides.

    Aim for approximately 1 distinct marking point.

    [1]