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On heating below 373 K, washing soda los...

On heating below 373 K, washing soda loses ____molecules of water of crystallization.

A

nine

B

eight

C

ten

D

seven

Text Solution

Verified by Experts

The correct Answer is:
A
Thus, monohydrate is formed
`Na_(2)CO_(3).10H_(2)Ooverset("below "373K)toNa_(2)CO_(3).H_(2)O+9H_(2)O`
above 373 K the monohydrate becomes completely anhydrous and changes to a white powder called soda ash, which dows not decompose further:
`Na_(2)CO_(3).H_(2)Ooverset("above "373K)toNa_(2)CO_(3)+H_(2)O`
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