![]() It is taken in completely and mixes with the absorbing material – eg absorbent cotton. Absorption is a process in which a liquid is soaked up, as with blotting paper. Adsorption is a process in which a gas, liquid, or a dissolved substance is gathered on the surface of another substance – eg charcoal. Students may find the difference between adsorption and absorption confusing. It does so by the process of adsorption, by attracting these molecules to the surface of the charcoal.Īdsorption by charcoal is also used to remove unburned hydrocarbons from car exhausts, harmful gases from the air, and unwanted colours from certain products. This activated charcoal can remove impurities in either the gaseous or liquid state from many solutions. When it is heated to an even higher temperature – about 930 ☌ – impurities are driven from its surface and it becomes ‘activated charcoal’. Heating wood to a very high temperature in the absence of air makes charcoal. The vinegar still smells after filtration, but noticeably less so. Students need to be warned that activated charcoal powder is extremely messy and difficult to remove from clothing. Note whether the filtered liquid has lost some of its original strong smell. Repeat the activity with another test tube, this time pour 100 cm 3 of malt vinegar through the charcoal.Note whether the drops of liquid in the test tube have lost the original colour. Carefully pour some of the coloured water on to the charcoal in the filter paper.Add one drop of ink or food colouring to 100 cm 3 of water in a beaker.Add about five spatulas of activated charcoal to the funnel.How to set up the equipment before using activated charcoal to remove unwanted colour from water ![]()
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