how is washing soda prepared from sodium carbonate? Give its chemical equation. State the type of this salt .Name the type of hardness of water which can be removed by it?
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Explanation:
Firstly, a cold and concentrated sodium chloride solution is reacted with ammonia and carbon dioxide to obtain sodium hydrogen carbonate. The sodium hydrogen carbonate is slightly soluble in water, so it precipitates out as solid. Secondly, now sodium hydrogen carbonate is separated by filtration, dried and heated.
NA₂CO₃
Sodium Carbonate is the disodium salt of carbonic acid with alkalinizing property. When dissolved in water, sodium carbonate forms carbonic acid and sodium hydroxide. As a strong base, sodium hydroxide neutralizes gastric acid thereby acting as an antacid.
Permanent hardness of water is removed by treatment with washing soda.
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