(i)Name the compound which is obtained from baking soda and is used to remove permanent hardness of water. (ii) Write its chemical formula (iii) What happens when it is re-crystallized from its aqueous solution?
1) Washing soda used to remove permenant hardness of water is obtained from baking soda
2) Chemical Formula - Na2CO3.10H2O
3) Anhydrous Sodium carbonate becomes hydrated when it is re crystallised from its aqueous solution .
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