Making salts
This practical lesson covers:
- How to prepare a pure, dry sample of a soluble salt from an insoluble oxide or carbonate
Producing a pure, dry sample of a soluble salt
Aim
To prepare a pure, dry sample of a soluble salt from an insoluble oxide or carbonate.
Background information
Acids react with metals, bases and carbonates to produce salts. In this practical, you will react sulfuric acid with insoluble copper (II) oxide to prepare an aqueous solution of the salt copper sulfate. You will separate unreacted copper (II) oxide by filtration and follow steps to evaporate the solvent to obtain a pure dry sample of copper sulfate crystals.
What is the purpose of filtering the solution?
to increase the yield of crystals
to remove impurities
to prevent the solution from boiling over
to speed up the evaporation process
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Where should the evaporating basin be left after evaporation?
in a cool place
in a warm place
in a hot oven
in direct sunlight
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What is the purpose of patting the crystals dry?
to remove excess water
to prevent the crystals from sticking together
to slow the crystallisation process
to increase the purity of the crystals
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Which piece of equipment is used to heat the sulfuric acid?
evaporating basin
filter funnel
bunsen burner
glass rod
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