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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
s Block Elements

NTA Abhyas 2020 · Chemistry · s Block Elements

The decahydrate form of sodium carbonate i.e. washing soda on...

The decahydrate form of sodium carbonate i.e. washing soda on standing in air effloresces and crumbles to powder. The number of water molecule(s) present in the compound formed is:

Correct answer

1

Step-by-step solution

Hydrated crystals of sodium carbonate exposed to air it losses it is 9 molecules of water of crystallization leaving only powder sodium carbonate with one molecule of water
The process of losing water of crystallization is called efflorescence
Na2CO3.10H2O(s)(decahydrate)→effloresces−9H2ONa2CO3.H2O(s)(monohydrate)N{a}_{2}C{O}_{3} . 10{H}_{2}O\left(s\right)\left(decahydrate\right)\overset{effloresces - 9{H}_{2}O}{\to}N{a}_{2}C{O}_{3} . {H}_{2}O\left(s\right)\left(monohydrate\right)
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