Green crystals of a substance changed their colour on heating in a closed test tube but regained it after sometime when they were allowed to cool down. Name the substance and write its formula.
(b) Name the compound whose one formula unit is associated with 10 water molecules. How is it prepared from sodium chloride? Give equations of related reactions. Give two uses of the compound.
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Green vitriol-iron sulphate heptahydrate
FeSO4.7H2O
Glauber's salt - Sodium sulphate decahydrate
Na2SO4.10H2O
Preparation of sodium sulfate decahydrate
2NaCl + H2SO4----Na2SO4 + 2HCl
Thus sodium sulfate decahydrate is prepared
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