Write the chemical name of `Na_(2)CO_(3).10H_(2)Oand Na_(2)CO_(3).` Writer the significance of `10H_(2)O.` Mention the term used for wate molecules attached with a slat. With the help of chemical equation explain the method of preparation of both `Na_(2)CO_(3).10H_(2)O and Na_(2)CO_(3).` Also list two uses of `Na_(2)CO_(3).10H_(2)O.`

Explanation

Chemical neme for `Na_(2)CO_(3).10H_(2)O:` Washing soda
Chemical name for `Na_(2)CO_(3):` Soda ash
`10H_(2)O` molecules attached with `Na_(2)CO_(3)` molecule are known as molecules of water of crystallisation. For the preparation of both the salts, consult section `2.12.`