Soluble Solid in Liquid: When a solid is dissolved in a liquid, it forms a solution that cannot be filtered out.
Techniques for Obtaining Solid from a Solution
1. Evaporation
Setup: Place the solution in an evaporating dish or crucible on a tripod.
Heating: Use a Bunsen burner to slowly heat the solution.
Process:
The solvent begins to evaporate, concentrating the solution.
Crystals start to form as the solution becomes more concentrated.
Eventually, all the solvent will evaporate, leaving dry crystals of the solid.
2. Crystallization
Setup: Use an evaporation dish to heat the solution gently, often using a water bath instead of a Bunsen burner.
Process:
Heat until some solvent evaporates and crystals begin to form.
Stop heating and allow the solution to cool.
More crystals will form as the solution cools because solids are less soluble at lower temperatures.
Conclusion
Both evaporation and crystallization are effective techniques for obtaining solids from solutions, but they involve different methods of heating and cooling.