8 Questions
To the solution of copper sulphate add thiourea solution with constant ______ and cool this mixture to the running water until the separated yellowish oil sticks to the wall of the containing beaker.
stirring
Dissolve 2 gm of crystalline cupric sulphate in 10 ml of ______ and dissolve 2 gm of thioures in 10ml of warm beaker and cool it to room temperature.
water
Take 2 gm of thiourea in another beaker and dissolve in 10 ml of hot ______ and cool it to room temp.
water
The crystals are Erystallized from 5% aqueous thiourea solution containing 2 ml of normal sulphuric acid per 100ml of solution.During recrystalisation temperature must be kept below ______.
80C
What is the purpose of adding thiourea solution to the copper sulphate solution?
To form a complex with copper ions
What is the key requirement during the recrystallization process?
The temperature must be kept below 80°C
How are the crystals separated from the mother liquor after completion of crystallization?
By filtration
What is the final step after obtaining the crystals?
Weigh the dry crystals to find out the percentage yield and purity
Learn the step-by-step procedure for extracting a copper complex in the chemistry lab. The procedure involves dissolving cupric sulphate and thiourea, mixing the solutions, and separating the resulting oil from the mother liquid through decantation.
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