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Q.

What is the formula of washing soda?

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a

Na2CO3.10H₂0

b

Na2CO3.H2O

c

Na2CO3.7H2O

d

Na2CO3

answer is D.

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Detailed Solution

  • Sodium carbonate decahydrate (Na2CO3.10H2O) is also referred to as washing soda. 
  • This is the most common hydrate of sodium carbonate containing 10 molecules of crystallising water. 
  • It is soluble in water and forms an alkaline solution.
  • It is used as a cleansing agent, glass and soap manufacturer, and also used to remove hardness.
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