Making Copper Sulfate
Copper Sulfate is a soluble salt
Made by reacting sulfuric acid and copper oxide together
- Copper oxide reacts with sulfuric acid but doesn't dissolve in water.
- Added a little at a time to warm sulfuric acid, the copper oxide forms a blue solution of copper sulfate
- When all the sulfuric acid had reacted, the copper oxide remains as a solide and makes a cloudy mixture, it is now in excess (this assures all the acid has been used up).
- The solution is then filtered, leaving a clear blue liquid.
- Excess copper oxide is washed, dried and reused
- Copper sulfate will start to crystallise as the water in the solution evaporates
- Evaporating slowly causes bigger crystals
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To prepare soluble salts using a soluble base, an indicator must be used.
- Acid is added to the base
- Inidicator changes color as it neutralises
- Burrette is used to add small amounts of acid at a time
- This is repeated till we have concordant results
- The method is then repeated without indicator and with the mean volume of acid recorded to produce a pure solution of the salt
- It is then left to evaporate and crystalise
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