Question

How to separate crystals of blue vitriol from its aqueous solution.Explain briefly​

Answer 1

Answer:

heat it in a test tube

Explanation:

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Answer 2

Explanation:

Theory

The given sample is shaken with water. A few drops of dilute sulphuric acid are added to it in order to prevent hydrolysis of copper sulphate. Copper sulphate present in the sample gets dissolved while the insoluble impurities are left behind. The solution is filtered. The filtrate is concentrated to the crystallisation point and then cooled. On cooling, crystals of copper sulphate (CuSO_{4}.5H_{2}O) separate out.

Requirements

Crude sample of copper sulphate, a 400 ml beaker, a china dish, a funnel, an evaporating dish and a policeman (glass rod).

Procedure

1. Preparation of Solution. Take about 25-30 ml of water and add to it small quantities of the powdered crude copper sulphate. Stir well to dissolve it. Make several additions of the powdered sample till a little of it remains undissolved even if it is stirred for sometime. Now add 2-3 ml of dilute sulphuric acid to make the solution clear. This prevents hydrolysis of the copper sulphate.

2. Filtration of the Solution and Concentration of the Filtrate to Crystallisation point. Filter the solution and collect the filtrate in a china impurities are left as residue on the filter paper.

Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume. As the solution gets heated up, it is stirred well with a glass rod to avoid crust formation on the side of the dish. If the crust is formed, it is dissolved into the solution by removing it with glass rod. Don’t allow the solution in the dish to boil.

Remove a drop of the solution at the end of a glass rod and cool it by blowing. The appearance of a crust or tiny crystals on the glass rod shows that the crystallisation point has reached. Now turn off the burner and stop heating. Transfer the hot saturated solution in a crystallising dish.

3. Cooling the Hot Saturated Solution. Place the crystallisation dish containing hot saturated solution on a beaker containing water filled to the brim and allow it to cool slowly for sometime. Deep blue crystals of copper sulphate will appear. After about half an hour, the crystallisation is complete.

prepare-crystals-pure-copper-sulphate-latexcuso_4-5h_2olatex-given-impure-sample-blue-vitriol

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