A procedure for producing copper(II) sulfate crystals is illustrated below. 1. Put dilute sulfuric acid into a beaker. 2. Heat the acid. 3. Continue adding copper(II) oxide until some remains unreacted in excess. 4. Filter the mixture. 5. Evaporate the filtrate until crystals begin to appear. 6. Allow the filtrate to cool. What are the purposes of step 3 and step 4?
- Astep 3: to ensure all of the acid has reacted; step 4: to obtain solid copper(II) sulfate
- Bstep 3: to ensure all of the acid has reacted; step 4: to remove the excess of copper(II) oxide
- Cstep 3: to speed up the reaction; step 4: to obtain solid copper(II) sulfate
- Dstep 3: to speed up the reaction; step 4: to remove the excess of copper(II) oxide