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Obtaining Pure Copper Sulphate from an Impure Sample
Transcript of Obtaining Pure Copper Sulphate from an Impure Sample
Why is crystallisation better
than simple evaporation method ?
What is crystallisation ?
How can We Obtain Pure Copper Sulphate from an Impure Sample?
Obtaining Pure Copper Sulphate
From An Impure Sample
Copper sulfate : a copper salt made by the action of sulfuric acid on copper oxide.
It is used as a Herbicide, Fungicide and Pesticide.
As a hair dye (with other chemicals).
Processing of leather and textiles.
To make Copper Sulphate Crystals.
Take some (approximately 5 g) impure sample of copper sulphate in a china dish.
Dissolve it in minimum amount of water.
Filter the impurities out.
Evaporate water from the copper sulphate solution so as to get a saturated solution.
Cover the solution with a filter paper and leave it undisturbed at room temperature to cool slowly for a day.
You will obtain the crystals of copper sulphate in the china dish.
The crystallisation method is used to purify solids. For example, the salt we get from sea water can have many impurities in it.
To remove these impurities, the process of crystallisation is used.
Crystallisation is a process that separates a pure solid in the form of its crystals from a solution.
This is because :
some solids decompose or some, like sugar, may get charred on heating to dryness.some impurities may remain dissolved in the solution even after filtration. On evaporation these contaminate the solid.
Purification of salt that we get from sea water.
Separation of crystals of alum (phitkari) from impure samples.
Thus, by choosing one of the above methods according to the nature of the components of a mixture, we get a pure substance. With advancements in technology many more methods of separation techniques have been devised. In cities, drinking water is supplied from water works.