Required Practical - making soluble salts

Question 1

describe a method to make a soluble salt by using an acid
( example of copper oxide and sulfuric acid)

Answer 1

equipment:
- bunsen burner
- beaker
-gauze
-tripod
-heatproof mat

method:

1. start with a fixed amount of dilute sulfuric acid ( this is the limiting reactant)
2. gently heat acid until almost boiling BUT DONT BOIL otherwise it will bubble over when you add the other reactant
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 and the solution will turn blue in colour ( the colour of copper sulfate)
6. keep putting copper oxide if solution is still clear blue
7. stop adding copper oxide if some powder remains after stirring - atp the reaction has stopped as all of the acid has reacted
8. use filtration to remove any unreacted copper oxide
9. place the copper sulfate solution in the evaporating basin and heat gently over a beaker of boiling water - heats until half of the solution remains
10. leave solution in a cool place for 24 hours for cystals to form
11. scrape crystals onto paper towel and gently pat dry