How many water molecules are present in washing soda


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The number of water molecules present in 1 molecule of washing soda is​

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Answer: 10

Washing soda has 10 water molecules as water of crystallisation. Water of crystallisation is the fixed number of water molecules present in one formula unit of a salt. When washing soda is exposed to air, it loses 9 molecules of crystallisation and becomes sodium carbonate monohydrate.

Na2CO3.10 H2O Air___> Na2CO3. H2O + 9 H2O


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