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Preparing Soluble Salts

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Making Soluble Salts
How to make a soluble salt by using an acid.
Preparing copper sulfate
1. Start with a fixed volume of dilute sulfuric acid. This is our limiting reactant.
2. Gently heat the acid until almost boiling.
3. Use a spatula to add small amounts of copper oxide to the acid.
4. Stir the solution with a glass rod.
5. The copper oxide will react and seem to disappear.
6. Continue adding copper oxide if the solution continues to be clear blue.
7. Stop adding copper oxide if some powder remains after stirring.
8. At this point the reaction has stopped. All of the acid has reacted.
9. Use filtration to remove the unreacted copper oxide.
10. Place the solution in an evaporating basin. Heat gently over a beaker of boiling water.
11. Heat until around half of the solution remains.
12. Leave the solution for 24 hours in a cool place for the copper sulfate crystals to form.
13. Scrape crystals onto paper towel and gently pat them dry.

Making a salt from an insoluble base
How to make copper sulphate from an insoluble base (copper oxide) and sulphuric acid?

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