In these scenes, the Year 9 chemistry students prepared a soluble salt, blue copper(II) sulfate crystals via a neutralisation reaction. First they added excess green copper(II) carbonate solid (base) to dilute sulfuric acid. Then they filtered the reaction mixture via filtration apparatus. The insoluble solid (residue) that remained on the filter paper was washed with distilled water to remove any soluble impurities to ensure purity. The blue solution that passed through the filter paper (filtrate) was collected and then crystallised to obtain pure, dry crystals of copper(II) sulfate (crystallisation).
During this experiment, students also maintained safe laboratory practices and achieved proper experimental skills, scientific writing, and record-keeping, as well as the skill of working in a team. Well done to all Year 9 Chemistry students!
Mr. J Borg
Chemistry Teacher