Title: Separation by Filtration and Crystallisation. The first year 11 Chem prac write up... the structure is at least correct... :p

Essay by FirestormHigh School, 11th grade February 2004

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Aim: To separate substances by the properties of filtering and crystallisation.

Apparatus and Chemicals: - balance.

- 100mL-beaker (2).

- Filter funnel stand and filter funnel.

- Bunsen, Tripod and gauze mat.

- Watch glass.

- Glass rod.

- 100mL Beaker (2)

- 25mL graduated cylinder.

- Filter paper

- Boiling Chips

- Matches

- NaCl/C mixture (sodium chloride/Charcoal 4g.)

- NaCl/CuCl^2 mixture (Sodium chloride/copper (II) chloride mixture, 8g.)

- C^2H^5OH (Ethanol, Approx. 25L.)

- Distilled Water


Part A

1. Place 4g of the NaCl/C mixture into a 100mL beaker. Add about 15mL of distilled water. Stir for about 2 minutes.

2. Set up a filter funnel. Into it place the filter paper, folded into a fluted pattern, and stand. [As in figure 1.1] Pour the whole mixture into the funnel and collect the filtrate in a 100mL beaker.

3. Wash the residue into the beaker with a further 5mL of water and pour into the funnel.

4. Add one or two boiling chips to the filtrate. Heat this with a Bunsen burner using a quite blue flame. Boil gently to reduce volume. As soon as some crystals begin to appear turn off and allow to cool.

Part B:

1. Place $ o the NaCl/CuCl^2 mixture in a 100mL beaker and dissolve in about 15mL of distilled water.

2.Warm the solution with a Bunsen burner using a quite blue flame until crystals begin to appear in the solution. Switch off and remove the Bunsen. Allow the solution to cool.

3.Filter the solid formed and wash with about 5mL of C^2H^5OH.

Part C:

1.Place 4g of NaCl/CuCl^2 mixture in a 100mL beaker and add about 15mL of C^2H^5OH.

2. Stir the solution for about 2 minutes and filter off the un-dissolved solids. Wash the solid...