How can it be proved that the water of crystallisation makes a difference in the State and colour of the compound
Answers
Answer:
it does
Explanation:
when we remove water of crystallisation,the water molecules present in the compound get removed and we are left with what is called the dehydrated form of that compound
for eg. when water of crys. is removed from Cu,it changes its color from blue to white
Explanation:
The water of crystallization:
It is the fixed number of water molecules present in one formula unit of salt.
For examples:
CuSO4.5H2O (Copper sulfate Penta hydrate) Blue vitriol.
FeSO4.7H2O (Ferrous sulfate heptahydrate) Green vitriol.
By heating these salts they lose their water molecules and hence result in a change in state and color taking place.
Blue vitriol is blue as it contains 5 molecules of water of crystallization.
When it is heated, it loses water of crystallisation and becomes anhydrous copper sulfate (CuSO4) which is grey-white.
On heating green vitriol, anhydrous ferrous sulfate (FeSO4) is formed, which is white.
Anhydrous ferrous sulfate (FeSO4) on further heating, decomposes into ferric oxide (Fe2O3), Sulfur dioxide (SO2), and sulfur trioxide (SO3) gas is released.