Question

Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Give an activity to illustrate how these two are interconvertible.

Answer 1

Hint: In chemistry, various chemicals react in different ways some react homogeneously and some others react to form other compounds. The change in the colour of the compounds may mark the proceeding of the reaction. In another case, the progress of the reaction is marked by the evolution of certain gases or the formation of certain compounds.

Complete step by step answer:
During chemical reactions, more than one compound will be reacting together for the formation of products. The progress of the reaction can be marked by various forms. The formation of the product may be related to the formation of certain chemicals. They may also be related to colour change or the certain change of the properties of the solution of the reaction vessel.
The formula of hydrated copper sulphate $ = $ $CuS{O_4}.5{H_2}O$
The formula of anhydrous copper sulphate $ = $ $CuS{O_4}$
These two forms of copper sulphate can be interconvertible through the following process
$CuS{O_4}.5{H_2}O\xrightarrow[{{H_2}O}]{\Delta }CuS{O_4}$ .
When the crystals of hydrated copper sulphate are heated in a boiling tube then the water of crystallization in the crystals is lost and the salt turns white.
However, when the crystals are moistened, the blue colour of the crystals reappears.

Note: The reactions of chemistry can be broadly classified into addition reaction, displacement reaction and elimination reaction.
Also in reaction the chemical group is added to the compound, in the displacement reaction one or more ions is displaced from the compound while in elimination the ion is removed or eliminated from the given compound.