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Metallurgy/Chemical analysis


"I did an experiment with cooper wire which is as follows:

First I took a copper wire and burnt it in excess of oxygen in a bunsen flame.

Black copper(II) oxide was formed.

Now I want to know how I could proceed with to obtain a final result of copper(II) chloride using sodium chloride.

Just for the sake of information I study in tenth grade.

An eager student,

Dear Eager Student,

Step 1
Prepare the sodium chloride as described here: making sodium chloride.
Step 2
Put the 100 grams of sodium chloride and the 213.62 grams of copper(II) sulfate pentahydrate (or 136,55 grams anhydrous copper(II) sulfate) together in the 500 ml beaker.
Add 500 milliliters of water.
Stir well, until nothing dissolves anymore. Crush any big lumps if possible.
Place the beaker into the pan and fill the pan with water (normal tap water is fine).
Heat the water in the pan, its ok if it boils, but its not necessary.
Dissolve any of the remaining chemicals in the hot solution. Keep stirring for a minute.
Step 3
Put out the heat and remove the beaker from the pan. Be careful, its hot!.
Let it cool down until you see crystals forming on the bottom of the beaker. Because its a dark green color, shining into it with a flashlight might help.
If crystals start to form, hang the thread into the solution, so that 1 or more centimeters is hanging into the solution.
If any cubic crystals form on the thread, you should remove the thread and hang a new one. Save the crystals though, for they are pure sodium sulfate. You should wash of any left over solution and dry them with some kitchen paper.
If long needle like crystals grow on the string this is copper chloride. Leave it hanging until the solution has fully cooled down.
Remove the string from the solution and make sure any excess liquid has dripped of the crystals. You can then dry the crystals with kitchen paper and remove them from the string. Collect them in the air tight jar for future use.
Step 4
Filtering the solution will remove any crystals from the bottom of the beaker, sodium sulfate crystals as well as copper chloride crystals. The solution you get will be a saturated solution of copper chloride and sodium sulfate.
Placing the string back into the solution and letting it slowly evaporate will cause more crystals to grow.
Its possible to speed the evaporation up by placing the beaker near a heat source or even in the oven.
The crystals from the filtration process can be collected from various processes. Combining these crystals, dissolvingen them again and repeating the whole crystalization process will give you more copper chloride crystals.
Repeat the whole process again for more copper chloride crystals.

Is it possible that not only CuCl2 is formed, but also CuCl? Not really, for the solubility of CuCl in water is only 0.062 g/L. If it had formed in large quantities, it would have formed a precipitate

All the best,


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1-Sand casting and ferrous and non-ferrous alloys 2-Gravity die casting,low pressure die casting,high pressure die casting of aluminium alloys.With a specialisation in auto-mobile components castings. 3-Alloy steel making on arc furnace,AOD,VOD,Con-cast root of alloy steel making. I have been working as Foundry man since last 27 years.

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I am a Metallurgical Engineer graduated from National institute of Technology,warangal(India) in 1984 and in 1991 i completed my masters degree in business administration(M.B.A.) from Institute of Management Technology,Ghaziabad(India).

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