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What is efflorescence?...

What is efflorescence?

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Efflorescence: When a compound loses its water of crystalisation on exposure to dry air is called efflorescence.
Example, Glauber.s salt [hydrated sodium sulphate `Na_2SO_4. 10 H_2O`] becomes a powdery anhydrous sodium sulphate when exposed to air.
`Na_2SO_4. 10H_2O overset"dry air"to Na_2SO_4 + 10H_2O`
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