Question

What are the examples of efflorescent substances?​

Answer 1

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An example of an efflorescent substance is the common copper (II) sulfate crystal CuSO4. 5H2O, a blue crystalline solid that when exposed to air, slowly loses water of crystallization from its surface to crystallize to form a white layer of anhydrous copper (II) sulfate. Na2CO3.

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Answer 2

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Efflorescence

It is the property of some salts to lose entirely, or somewhat, their water of crystallization when their crystals are exposed to dry air even for a short time. They become powdery. Such substances are called efflorescent substances.

Examples of efflorescent substances:

=> Washing soda [hydrated sodium carbonate], when exposed to dry air, becomes a monohydrate.

=> Glauber's salt [hydrated sodium sulphate], becomes a powdery anhydrous sodium sulphate when exposed to air.

=> Epsom salt [magnesium sulphate heptahydrate], when exposed to dry air, becomes a monohydrate.

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