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MgNH4PO4.6H2O loses H2O stepwise as it is heated. Between 40°C and 60°C the monohydrate (MgNH4PO4.H2O) is...

MgNH4PO4.6H2O loses H2O stepwise as it is heated. Between 40°C and 60°C the

monohydrate (MgNH4PO4.H2O) is formed and above 100°C the anhydrous material

(MgNH4PO4) is formed. Why, then, do the instructions say to air dry the precipitate

and filter paper at room temperature?

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The precipitate formed in the process is MgNH4PO4.6H2O.

Since the precipitate loses its water of crystallization and becomes anhydrous compound when heated , so the compound is instructed to air dry at the room temperature.

If the compound loses its water of crystallization and we are unaware about it , then the assumption of number of moles of desired component will be calculated incorrect.

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