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C-3
In this experiment, you will perform a few simple tests on some selected hydrates to study their properties.
You will also be given an unknown hydrate, for which the number of molecules of water and the ions present,
are to be determined. You will obtain a known mass of the unknown hydrate in a test tube, and then drive off
the water of hydration by heating the hydrate to obtain the anhydrous salt. By weighing the dried salt in the
test tube, you will be able to determine the mass of water that is lost and, when you have determined which
ions are present, you will then be able to determine the empirical formula of the hydrate.
As there will be some time spent waiting for the test tube to cool, start immediately with Part I, the
determination of the percentage of water in the unknown hydrate. Cycles of heating, cooling, and weighing are
repeated in Part I until the final mass of the anhydrous residue is constant. During the waiting (cooling)
periods, do Part II and run the chemical tests to determine what ions are present (Part III).
ADVANCE STUDY ASSIGNMENT:
