(a) Name the compound which is obtained from baking soda and is used to remove permanent hardness of water. (b) Write its chemical formula (c) What happens when it recrystallised from its aqueous solution?
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(a) Sodium carbonate is obtained from baking soda and is used to remove hardness of water.
(b) Its chemical formula is Na2CO3
(c) When it is recrystallized with water, tt changes to washing soda, Na2CO3.10H2O.