How can you see copper sulphate dissolve in water?

Answer 1

Take some copper sulfate solid and add it to a beaker of water. Stir and you will see that the solid slowly disappears to form a blue solution. Copper sulfate has dissolved and is therefore soluble in water. Anhydrous copper sulfate is a white solid while hydrated copper sultate (CuSO4.5H2O) is blue.

Answer 2

First you can observe the colour of the solution which has to be tested. If the solution shows no colour, it can be straightly concluded that there is no Copper(II) ions present. If it shows a colour, carry out the following tests.

1. Bubble hydrogen sulfide gas through the solution, a black precipitate MAY be formed from Copper(II) ions.
2. Add a solution of sodium hydroxide followed by heating. At first there will be a greenish blue precipitate which will turn black if Copper(II) ions present. The precipitates are copper hydroxide and copper oxide respectively.
3. Add an aqueous ammonia solution to the provided solution. If a greenish blue precipitate forms and if it does dissolving in excess ammonia, those observations verify that there are Copper(II) ions present in the solution.

The reactions for these experiments are given below.

Experiment 1

Cu2+(aq) + H2S(g) --> CuS(s) + 2H+(aq)

Some other ions such as nickel, bismuth, lead, silver etc. will show positive results for this test.

Experiment 2

Cu2+(aq) + 2NaOH(aq) --> Cu(OH)2(s) + H2O(l)

Cu(OH)2(s) --> CuO(s) + H2O(l)

Experiment 3

Cu2+(aq) + 2NH3(aq) + H2O(l) --> Cu(OH)2(s) + 2NH4+(aq)

Cu(OH)2(s) + 4NH3(aq) --> [Cu(NH3)4]2+(aq) + OH-(aq)

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When copper react with sodium hydroxide, copper hydroxide is one of the products which has a distinct colour, so...

1) Add a few drops of dilute sodium hydroxide to the solution you wish to test for copper ions

2) If a blue precipitate forms (copper hydroxide is insoluble in water), then it's likely that copper ions are present

3) To confirm the presence of copper ions, add ammonia solution & if the precipitate dissolves, forming a deep blue solution, you know copper ions are present

Answer 3

Add Barium Chloride which will give a white precipitate of Barium Sulohate

Answer 4

you just to put the copper sulphate in the water and stir it until it has dissolved

Answer 5

the water will turn blue and cold

i know coz i did this in science

by afsanalol

Answer 6

Copper sulfate dissolves in water to form a copper sulfate solution.

Answer 7

If you evaporate the solution, the water from the copper sulphate will 'disappear' and you will be left with the crystallized copper sulphate.