Magnesium nitrate Synonyms: Magnesium nitrate hexahydrate Molecular Formula: Mg(NO3)2.6(H2O) Molecular Weight: 256.41 CAS No.: 13446-18-9 Technical Data Sheet: Indexes Special Grade FineChemical Grade Industrial Grade Content [Mg(NO3)2?6H2O] ≥ 98.0 % ≥ 98.0 % ≥ 98.0 % Water insoluble ≤ 0.01 % ≤ 0.03 % ≤ 0.04 % Chloride (Cl) ≤ 0.01 % ≤ 0.01 % --- Sulfate (SO4) ≤ 0.02 % ≤ 0.03 % --- Calcium (Ca) ≤ 0.1 % ≤ 0.2 % --- Manganese (Mn) ≤ 0.005 % ≤ 0.005 % --- Ferrum (Fe) ≤0.001 % ≤0.001 % ≤0.001 % Arsenic (As) ≤ 0.0002 % ≤ 0.002 % --- Barium (Ba) ≤ 0.005 % ≤ 0.01 % --- Heavy metal content (based on Pb) ≤ 0.001 % ≤ 0.002 % ≤ 0.002 % PH 3.0--5.0 3.3-4.5(25%solution) 3.0--5.0 .