Drying L 3 BTEC Applied Science Unit 4

Drying L 3 BTEC Applied Science: Unit 4 With filtering and Precipitation Separation Techniques Copper carbonate is a blue-green compound often found on the bronze, brass or copper roofs of old buildings. Once, it would have used as a pigment in paints and make-up. Nowadays, it is used as an algaecide in farm ponds Aim You will explore how these salt deposits are formed. You will investigate the difference in crystal size dependent on the rate of evaporation of the water Equipment • 0. 5 M Copper Sulphate Solution • 0. 5 M Sodium Carbonate Solution • 2 x 10 cm 3 measuring cylinders • 2 x boiling tube • Funnel • Filter paper • Glass rod • Distilled water • Test Tube Rack • Markers Safety Copper Carbonate can be toxic to humans if ingested Dust of dry copper carbonate may irritate lungs and eyes Method Assemble all the apparatus you will need. You will need to follow the procedure below: 1. Measure out 10 cm 3 of copper sulphate solution and pour into a test tube 2. Measure out 10 cm 3 of sodium carbonate solution and add it to the copper sulphate solution 3. Filter off the solid copper carbonate that has formed 4. Wash the solid with distilled water 5. Write your name on the filter paper and leave the copper carbonate in a warm place to dry

Observations What colour is the copper carbonate you have obtained? __________________________________________ Why is the solid washed in step 4? ___________________________________________________________________________________ What is left when the copper carbonate has been filtered off? ___________________________________________________________________________________ What is the equation for this reaction? __________________________________________ Further Context How does your experiment link to the real world? ___________________________________________________________________________________ How could this experiment be altered to be conducted on a larger scale? ___________________________________________________________________________________