Write the chemical name of `Na_2CO_3. 10 H_2O` and `Na_2CO_3`. Write the significance of `10 H_2O` Mention the term used for water molecules attached with a salt. With the help of a chemical equation , explain the method of preparation of both `Na_2CO_3. 10 H_2O` and `Na_2CO_3`. Also list two uses of `Na_2CO_3. 10 H_2O`

Explanation

`Na_2CO_3. 10 H_2O`: Sodium carbonate decahydrate.
`Na_2CO_3`: Anhydrous sodium carbonate
`10 H_2O`: Water of crystallization which impacts shape and colour to the crystals.
Preparation:
`NaCl+H_2O+CO_2+NH_3to Nh_4Cl+NaHCO_3`
`2NaHCO_3 to^(Heat) Na_2CO_3+ H_2O+ CO_2`
`Na_2CO_3+ 10H_2O to Na_2CO_3. 10 H_2O`
Uses:
(i) Used in glass, soap and paper industries.
(ii) Used in the manufacture of borax.
(iii) Used as a cleaning agent for domestic purpose.