At the start of the demonstration, turn on the pump so that a gentle stream of air is drawn through the apparatus.Place a piece of blue cobalt chloride paper into the first boiling tube and half-fill the second boiling tube with limewater.Ensure that the connections to the boiling tubes are the correct way round. Before the demonstration, assemble the apparatus as shown in first diagram above.Alternative means of carrying out vacuum filtration and drawing air through solutions are suggested in this section of the Laboratory Handbook. It is strongly recommended that this is referred to before purchasing or using such pumps – it may not be possible or appropriate to use this type of equipment in your school or college. The use of traditional water-operated filter pumps for vacuum filtration and for drawing air through solutions is covered in section 10.6.4 of the CLEAPSS Laboratory Handbook. Information about the type and use of various grades of filter papers can be found in section 9.11.4 of the CLEAPSS Laboratory Handbook.
#AGE OF WATER AND CARBON DIOXIDE HOW TO#
How to set up and seal a right-angled bend connected to the funnel Calcium hydroxide solution, ‘limewater’, Ca(OH) 2 (aq), (treat as IRRITANT) – see CLEAPSS Hazcard HC018 and CLEAPSS Recipe Book RB020. Ideally, the limewater should be made fresh on the day.See the standard procedure for preparing and using cobalt chloride papers for more information. Minimise handling of cobalt chloride paper (SENSITISER) and wash hands after use (cobalt chloride is a category 2 carcinogen). Cobalt chloride paper can be stored in a desiccator. Cobalt chloride/cobalt chloride paper (TOXIC, DANGEROUS TO THE ENVIRONMENT) – see CLEAPSS Hazcard HC025 and CLEAPSS Recipe Book RB030.Read our standard health and safety guidance.Limewater (treat as IRRITANT), about 20 cm 3.Piece of blue cobalt chloride paper (TOXIC).
The physics of restoration and conservation.
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