Question

In the process of crystallisation: In a laboratory, crystals can be obtained by cooling a fused mass. Explain how it can be done with example.

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Answer 1

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crystallisation process

crystallisation process result in a physical change in objects. it leads to the formation of crystal structures clear distinguish between process of crystallisation is not possible but we can identify two categories of crystallisation process namely cooling crystallisation and evaporative Crystallisation

cooling crystallisation

many substances when dissolved in solvent from crystals on cooling in favorable conditions in this process. however this method is not very common and has many limitations usually the substance is heated and then allowed to cool down in this method.

evaporative crystallisation

it is more common than cooling crystallisation evaporating sea water leaves salt behind salt crystals of substance are deposits after evaporation of solution but this method required a high concentration of the substance in the solution therefore it's solute/solvent mass ratio should be high.

for example

experiment no. 1

1) first of all, take some water in a beaker add a few drop of dilute sulphuric acid (H2SO4)

2) heat the mixture on a burner add a copper sulphate powder when it starts boiling.

3) keep stirring the solution keep adding copper sulphate to the solution until it is soluble .

4) now filter the solution and allow it to cool down .

5) you will see crystals of copper sulphate suspended in the solution