React the magnesium oxide with the dilute nitric acid.
Evaporate the water, slowly, to grow the magnesium nitrate crystals.
Dry in the oven.
Explanation:
First the magnesium oxide (MgO) is reacted with the diluted nitric acid (HNO₃):
MgO + 2 HNO₃ → Mg(NO₃)₂ + H₂O
We filtrate the solution the magnesium nitrate, leave the beaker unperturbed in order that the water to evaporate thus promoting the growing of Mg(NO₃)₂·6 H₂O crystals.
To remove the water from the crystals, the hydrated magnesium nitrate (Mg(NO₃)₂·6 H₂O) need to be placed in an oven in order to remove the water molecules to obtain the anhydrous magnesium nitrate (Mg(NO₃)₂) Anhydrous magnesium nitrate will be stored in a dry medium because it is hygroscopic and it will take water molecules from the air.
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