Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
Chapter12: Chirality
Section: Chapter Questions
Problem 10CTQ
Related questions
Question
Draw a schematic diagram using this information.
Preparation of the solution
- Take about 25-30 ml of distilled water in a beaker and add powdered crude copper sulphate while stirring the solution so that the powder dissolves.
- Keep adding the powdered sample till a little of it remains undissolved, even if it is stirred thoroughly.
- Now add 2-3 ml of dil. H2SO4 to make the solution clear. This prevents the hydrolysis of copper sulphate.
Filtration of the solution
- Take a funnel and fix a filter paper in it and clamp it to a stand.
- Place a china dish under the funnel. The stem of the funnel should touch the wall of the china dish to avoid the solution splashing out.
- Pour the solution into the funnel over a glass rod and collect the filtrate in a china dish. The insoluble impurities are left in the filter paper as residue.
Concentration of the filtrate to crystallisation point
- Heat the china dish on a sand bath till the solution is reduced to about one-third of its original volume.
- To avoid crust formation on the sides of the dish, stir the solution continuously with a glass rod. If crust is formed, it can be dissolved in the solution by removing it with the glass rod. Don’t allow the solution in the dish to boil.
- To know if the solution has reached its crystallisation point, use the end of the glass rod to remove a drop of the solution and cool it by blowing on it. The appearance of a crust or tiny crystals on the glass rod shows that the crystallisation point has been reached.
- Turn off the burner and stop heating.
- Transfer the hot saturated solution into a crystallising dish.
Cooling the hot saturated solution
- Place the crystallisation dish containing the hot saturated solution in a trough containing water filled to the brim and allow it to cool slowly for sometime.
- Deep blue crystals of copper sulphate will be formed. The crystallisation will complete after half an hour.
Separation of crystals and drying
- Decant the mother liquor carefully into a beaker.
- Wash the crystals with a little ethyl alcohol containing a small amount of cold water.
- Place the crystals on a filter paper which will soak up the solution.
- Transfer the crystals to another filter paper and dry them by pressing gently between the folds of the filter paper or by spreading on a porous plate.
- Transfer the crystals into a dry test tube and cork it.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps with 1 images