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Sodium Phosphate Microcrystal Test for Magnesium

The material suspected of containing magnesium may be taken into solution as the chloride. To this neutral solution add a few crystals of ammonium chloride and citric acid. After this is dissolved add a drop of concentrated sodium phosphate (HNaPO4). Now cause a drop of concentrated ammonium hydroxide to flow into the test drop. The initial reaction is granular but characteristic crystals soon form.

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