INORGANIC cHEMISTRY - III

BSCM401

Experiment 1

Aim of the Experiment

To prepare Tetra amine Copper Sulphate.

Principle

Reaction:

Tetra-amine Copper Sulphate is prepared by adding Ammonia to a solution of Copper Sulphate. When Cupric Hydroxide is precipitated which dissolves in excess of ammonia to give deep blue colour. The hydrated tetra-amine copper 2-sulphate and is then precipitated from the solution by adding ethanol.

CuSO₄ +4NH₃+ H₂O → [Cu(NH₃)₄]SO₄.H₂O

Tetra amine Cu(II) Sulphate

(Blue Crystals)

Materials required

Chemicals Required:

Concentrated Ammonia- 10ml

Ethyl Alcohol - 15ml

Copper sulphate- 5gm

Apparatus Required:

Beaker, Glass Road, Glass Funnel, Filter paper, Conical Flask.

Procedure

Take 5gm of crystalline CuSO₄ in 250ml Beaker.
Dissolve it in minimum quantity of water adding a few drops of H₂SO₄.
Now add concentrated ammonia solution (1:1) to the beaker with constant stirring until the blue precipitate of cupric hydroxide first form completely.
Dissolve to yield a deep blue solution. There should be a smell of ammonia in the beaker.
Now, Add 10-12 ml of ethanol, with constant stiring and keep the beaker on ice bath for about 10 minutes.
Long Needle shaped blue crystals of tetra amine copper(II) sulphate separate out.
Filter this and wash this crystals with a few drops of alcohol and dry them.

preparation_of Tetraamine_copper_2 sulphate_HD 720p_(1).mp4

Calculation:

Molecular Weight of Copper Sulphate - 159 gm/mol

Molecular Weight Tetra amine copper(II) - 245 gm/mol

If 159 gm of Copper Sulphate gives 245 gm of Tetra amine Copper(II)

Then 5 gm of Copper Sulphate gives ………….

Result

Theoritical Yield=……………
Practical Yield=……………..

% Yield= Practical Yield*100/Theoritical Yield

% Yield=………………..

Conclusion

Theoritical Yield=……………
Practical Yield=……………..

% Yield= Practical Yield*100/Theoritical Yield

% Yield=………………..

Reference Material

Vogel’s Textbook of Quantitative Chemical Analysis.

Questions

What is the coordination number of Cu²⁺ in given complex?
Write the reaction involved in the above process?
What is the geometry of copper metal in the complex?

Developed by

Dr. Rajni Pania,

Assistant Professor, Chemistry

rajni.pania@gsfcuniversity.ac.in

Ms. Khyati Joshi

Teaching Assitant , Chemistry

khyati.joshi@gsfcuniversity.ac.in

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