Singapore GCE N(A)-Level Science (Chemistry, Biology) Practice Questions - Singapore-Cambridge GCE Normal (Academic) Level Science (Chemistry, Biology) Exam

Filter the solid mixture directly without adding water. Dissolve the mixture in water, filter to remove sand, then evaporate the filtrate to dryness. Dissolve the mixture in water, filter to remove sand, heat filtrate to saturation, and leave to cool. Distill the solid mixture at high temperatures to collect copper(II) sulfate vapor.