separating mixtures

fractional distillation -

• purity measured by checking boiling points.
• separates 2 or more liquids with different boiling points.
• 1. heat mixture with an electric heater in flask with fractioning column.
• 2. vapours begin to form.
• 3. liquids with low boiling points evaporate first, pass through the condenser are are collected.
• 4. temp raised to collect higher boiling points (and to distill water).
• uses: purify or strengthen alcohols.

crystilisation - 

• separates a soluble solid from a liquid.
• 1. solution in evaporating dish.
• 2. heat over bunsen burner.
• 3. water evaporates so amount of liquid decreases.
• 4. solid particles left behind.
• 5. once all has evaporated,…