Experiment1Separation of mixtures by filtration and crystallisationBackgroundThe separation of a mixture of two solids can often be achieved by filtration and crystallisation. To be successful, this requires that the components of the mixture have different solubilities in a particular solvent.
AimThe purpose of this experiment is to separate sodium chloride/charcoal and sodium chloride/copper(II) chloride mixtures.
Equipment requiredBalanceFilter funnel standFilter funnelBunsen, tripod and gauze matWatch glassGlass rodBeakers (two 100mL)Graduated cylinder (25 mL)Filter paper (Whatman No. 1ÃÂthree 12.5 cm sheets)Sodium chloride/charcoal mixture (4 g)Sodium chloride/copper(II) chloride mixture (8 g)Ethanol (25 mL)Distilled waterBoiling chipProcedureA Separation of a Sodium Chloride and Charcoal Mixture#1 Place 4 g of the salt/charcoal mixture in a 100 mL beaker and add about 15 mL of distilled water. Stir the mixture for about two minutes to allow the salt to dissolve.
#2 Set up a filter funnel with filter paper on a filter funnel stand. Filter the mixture and collect the filtrate in a 100 mL beaker as shown in Figure 1.1.
#3 Wash the solid with a further 5 mL of water but do not add this to the filtrate.
Note and record the appearance of the solid#4 Add a boiling chip to the filtrate. Heatthe solution with a Bunsen burner andboil gently to reduce the volume.
#5 When crystals of sodium chloride appear, turn off the Bunsen and allowthe solution to cool.
#6 Record the appearance of the sodiumchloride crystals.
B Partial Separation of a Sodium Chloride and Copper (II) Chloride Mixture#1 Place 4 g of the sodium chloride/copper (II) chloride mixture in a 100 mL beaker and dissolve in about 15 mL of distilled water.
#2 Warm the solution with a Bunsen and boil gently until crystals begin to appear in the solution. Remove the Bunsen and cool the solution.
#3 Filter the solid...