Chemistry Required Practical: Making Salts

GCSE Chemistry Required Practical - Making Salts

Preparation of a pure, dry sample of a soluble salt from an insoluble oxide or carbonate using a Bunsen burner to heat dilute acid and a water bath or electric heater to evaporate the solution.

Method:

1. Measure 40 cm³ sulfuric acid and put it into the 100 cm³ beaker.
2. Set up the Bunsen burner, tripod, gauze and heatproof mat. Put the beaker on the gauze and heat the acid gently until it is almost boiling. Turn off the Bunsen burner.
3. Remove the glass beaker from the tripod. Use the spatula to add a small amount of copper (II) oxide powder to the hot acid. Stir with the glass rod. The copper (II) oxide will disappear and the solution will turn clear blue.
4. Add some more copper (II) oxide and stir again.
5. Keep adding the copper (II) oxide until some of it remains after stirring.
6. Allow the apparatus to cool completely.
7. Set up the filter funnel and paper over the conical flask. Filter the contents of the beaker.
8. Pour the filtrate from the conical flask into the evaporating basin.
9. Set up a water bath using the 250 cm³ beaker on the tripod and gauze.
10. Evaporate the filtrate gently using the water bath.

Making Salts - GCSE Science Required Practical
Investigate the preparation of pure, dry hydrated copper sulfate crystals starting from copper oxide including the use of a water bath.

1. Recall that a base is any substance that reacts with an acid to form a salt and water only.
2. Explain the general reactions of aqueous solutions of acids with metal oxides to form salts.
3. Describe a neutralisation reaction as a reaction between an acid and a base.
4. Explain why, if soluble salts are prepared from an acid and an insoluble reactant:
   a) excess of the reactant is added
   b) the excess reactant is removed
   c) the solution remaining is only salt and water

GCSE Chemistry Required Practical: Making Soluble Salts

Describe how to make a soluble salt by using an acid.

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Check out the sample question and solution on Sample Assessment Material (page 65).
This example is taken from the sample assessment material, paper 1CH0/1F, Q2.

Some ammonium phosphate solution was made.
Describe how pure, dry crystals of ammonium phosphate are obtained from the ammonium phosphate solution.

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