1.

(i) Write the chemical name and chemical formula of washing soda. (ii) How is it obtained from sodium chloride? Give equations of the reaction. (iii) Why it is called a basic salt?

Answer»

Solution :(i) CHEMICAL name : Sodium carbonate decahydrate
Formula: `Na_2CO_3. 10 H_2O`
(II) `NaCl+H_2O+CO_2+NH_3 toNh_4Cl+NaHCO_3`
`2NaHCO_3 to^(Delta)Na_2CO_2+CO_2 uparrow+H_2O`
`Na_2CO_3+10H_2O toNa_2CO_3. 10 H_2O`
It is a basic salt because when dissolved in water, it gives a strong base NaOH.
It is used as a cleaning agent, in PAPER and glass industry.


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