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Prepare crystals of pure copper sulphate from a given impure sample of blue vitriol

Answer» The crystals of pure blue color copper sulfate (\xa0)Explanation:Experiment to prepare crystals of pure Copper Sulfate (\xa0) from a given impure sample of the blue vitriol is as follows -Theory -\tSample + water + few drops of dilute sulfuric acid ( to prevent hydrolysis of copper sulfate).\tCopper sulfate is dissolved and the insoluble impurities are left over.\tThe solution is filtered out. The filtrate is concentrated up to the crystallization point and then cooled.\tAfter cooling, crystals of copper sulfate (\xa0) is filtered out.Requirements -\xa0Copper sulfate sample, a beaker, a china dish, a funnel, test tube, a glass rod, an evaporating dish and a policemanProcedure -\xa0Preparation of Solution\tTake about 25-30 ml of water + pinch of the powdered crude copper sulfate. Stirring the solution and repeating the same additions and stirring until some of it remains undissolved + 2-3 ml of dilute sulfuric acid (making the solution clear that prevents hydrolysis of the copper sulfate)Formation of crystals\tThe solution is filtered out. The filtrate (left in a china dish) is concentrated up to the crystallization point and then cooled. Heating the solution till it is reduced to about one-third of its original volume. Stir it to avoid the crust formation\tThe formation of a crust or tiny crystals on the glass rod indicates the crystallization point. Now stop heating.Transferring and cooling the hot saturated solution in the crystallizing dish. On cooling it we will get deep blue crystals of copper sulfateSeparation of Crystals and Drying\tDecant + Wash the crystals with a little ethyl alcohol + water\tFiltered on filter paperConclusion -\xa0The crystals of pure blue color copper sulfate (\xa0) are obtained that are transparent.


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