Simple Distillation
To be able to separate a dissolved solid from a liquid and keep the liquid you need simple distillation.
Evaporate the liquid by heating. This turns the liquid into vapour. Condense the vapour back into a liquid by cooling
1. Heat the solution until it boils (example → bunsen burner)
2. The vapour rises up the glass tube
3. The vapour condenses as it passes through the condenser