Description Magnesium Sulfate Heptahydrate, ACS, 98-102%, 500g For Research & Development Not for drug, human, animal, or food use Certificate of Analysis: Purity (by Titration) 98.0-102.0%Appearance (Color) Colorless Appearance (Form) Crystals Ammonium (NH4) <0.002% Calcium (Ca) <0.02% Chloride (Cl) <0.005% Heavy Metals (as Pb) <0.005% Insoluble Matter <0.005% Iron (Fe) <0.005% Manganese (Mn) <0.005% Nitrate (NO3) <0.002% pH of 5% Solution at 25°C 5.0-8.2 Potassium (K) <0.005% Sodium (Na) <0.005% Strontium (Sr) <0.005% CAS: 10034-99-8 FORMULA: MgSO4 · 7H2O