and
Write the significance of
. Mention the term used for water
molecules attached with a salt. With the help of chemical equation, explain the
method of preparation of both and Also list two uses of 
Answer:
is hydrated sodium carbonate salt or
sodium carbonate with water of crystallisation.
is anhydrous sodium carbonate or salt
of sodium carbonate (anhydrous). 
means water crystallisation.
It impacts on the colour and shape of the crystals. (2)
Preparation 
Uses
(i) Used in glass, soap and paper industries.
(ii) Used for removing hardness of water. (1)
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