A clear solution should collect in the flask.Only pour in enough solution at a time to leave the solution level 1 cm below the rim of the filter paper. Swirl the reaction mixture gently, and pour a little at a time into the filter paper in the funnel.Fold the filter paper to fit the filter funnel, and put it in place.Place the filter funnel in the neck of another conical flask.Mix 25 cm 3 of magnesium sulfate solution and 25 cm 3 of sodium carbonate solution in a conical flask.Magnesium carbonate, 3MgCO 3.Mg(OH) 2.3H 2O(s) – see CLEAPSS Hazcard HC059b.Magnesium sulfate solution, MgSO 4(aq) – see CLEAPSS Hazcard HC059b.Sodium carbonate solution, Na 2CO 3(aq) – see CLEAPSS Hazcard HC095a and CLEAPSS Recipe Book RB080.All containers used for these solutions should be labelled. If the reagent solutions can be distributed in pre-measured quantities, waste is reduced and lesson organisation is easier.
Read our standard health and safety guidance. Magnesium sulfate solution, 0.5 M, 25 cm 3. Sodium carbonate solution, 0.5 M, 25 cm 3. The cheapest grade of filter paper is okay for this experiment. The size of filter paper, when folded, should match the funnel size. Polythene filter funnels are safer and cheaper than glass funnels. Filter papers (size suited to funnels used). Filter funnel (65 mm diameter or similar, note 1). This experiment is therefore suitable as a class experiment for most classes. Even these can be minimised by the use of polythene filter funnels. So the few other safety issues are essentially restricted to safe handling of glassware. Sodium carbonate in dilute solution is weakly alkaline. If the solutions can be provided in pre-measured 25 cm 3 quantities in labelled containers, distribution of chemicals and control of quantities can be easily managed, and the practical work can begin without delay. It should take no more than 20 minutes to the point at which the wet product can be set aside to dry. This is a short standard class experiment. In this experiment the soluble salts are magnesium sulfate and sodium carbonate, and the insoluble salt formed is magnesium carbonate, which can be filtered, dried and collected. Hamied Inspirational Chemistry Programme. Introductory maths for higher education. The physics of restoration and conservation.
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