Question

chemical name of Al2O3. nH2O

Answer 1

Al2O3. nH2O

-It is called Alumina Trihydrate or simply 'Hydrate. (when n=3 i.e compound becomes Al2O3.3H2O)

-It is named according to the water to crystallization added to the compound i.e it depends on the value of n.

-When n=2 then the compound is ore of Aluminium called Bauxite.

Compound = Al2O3.2H2O

This is called Bauxite from which aluminum is extracted.

It is also used for the preparation of Alumina.

-Molar mass of Al2O3·nH2O is 133.9833 g/mol.

Remember

-The water of crystallization or water of hydration is water molecules that are present inside crystals.

-It does not mean that the salt is wet as it is attached to the formula unit of a salt.

Answer 2

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Chemical name of Al2O3. nH2O is Alumina Trihydrate.