How can I determine the percentage purity of magnesuim carbonate in a digestion tablet containing this compound using both thermal decompostion and the reaction with an acid?
Ulex replies You will have to assume that the tablets contain only one compound, the magnesium carbonate, which decomposes on heating and which reacts with hydrochloric acid. It is quite important to make a point about this in your write-up. Thermal decomposition Weigh a sample of the tablet (crush it first). Heat it strongly to decompose it into magnesium oxide and carbon dioxide. Let it cool and weigh the solid residue. How do you know whether all the magnesium carbonate has decomposed? Answer, heat it again, cool and re-weigh. If it doesnt get any lighter in mass, it was fully decomposed. If it does you will have to repeat the heating, cooling and re-weighing until it reaches a constant mass. The loss of mass compared with the original is the mass of carbon dioxide produced. Use the equation to work out from this the mass of magnesium carbonate which produces this amount of carbon dioxide. Compare this with your first weighing and find the percentage purity. Reaction with acid You c
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