Required Practical 1: Making soluble salts

Salts (e.g. Copper sulfate) positive ion comes from…

metal ion

Which chemicals give metal ion? With an example

• metal - copper

• metal oxide - copper oxide

• metal hydroxide - copper hydroxide

• metal carbonate - copper carbonate

Salts negative ions comes from…

acid

Which chemicals give negative ion?

acid, e.g. sulfuric acid

Equiment needed to make soluble salt?

Process of making soluble salt p1

• Start with a fixed volume of dilute sulfuric acid (limiting reactant - used up)

  • to ensure no acid remain at the end as it will contaminate salt

• Gently heat acid until almost boiling

  • could potentially boil over when adding other reactants and that’s dangerous

• Use spatula to add small amounts of copper oxide to acid

• Stir solution with glass rod

• Copper oxide will react and seem to disappear forming a blue colour

• Continue adding copper oxide if solution continues to be clear blue

• Stop adding coper oxide if some powder remains after stirring

• Reaction is complete - all of acid has reacted

Process of making soluble salt p2

• Use flitration to remove unreacted copper oxide

• Place solution in evaporating basin

• Heat gently over a beaker of boiling water

• Heat until half of solution remains

• Leave solution for 24 hours in a cool place for crystals to form

• Scrape crystals onto paper towel and gently pat them dry