1) Magnesium nitrate: 98.0, 98.0 pct min 2) Water insoluble: ... ) ... Molecular formula: Mg(NO3)2.6H2OMolecular weight: 256.40Physicochemical properties: Magnesium nitrate hexahydrate is colorless crystal of monoclinic system. It is ... 4) Heavy metal: 0.002, --- pct max5) PH: 4, ---6) Magnesium oxide (MgO): ---, 15.0 pct min7) Nitrogen: ---, 10.7 pct ...