Used in preparation of magnesium standard solutions.||Synonyms:|Epsom salts| |CAS No:|10034-99-8| |Molecular Formula:|MgSO4·7H2O| |Molecular Weight:|246.5| |Purity:|98.0-102.0% (Titration) ||Appearance:|White crystals| |Solubility (water at 20°C):|72g in 100ml||Heavy Metals:|≤0.0005% (as Pb)||pH (5%):|5.0-8.2||Insoluble Material:|≤0.005%||Chloride (Cl-):|≤0.0005%||Nitrate (NO3-):|≤0.002%||Ammonium (NH4):|≤0.002%||Calcium (Ca):|≤0.02%||Manganese (Mn):|≤0.0005%||Potassium (K):|≤0.005%||Sodium (Na):|≤0.005%||Strontium (Sr):|≤0.005%||Iron (Fe):|≤0.0005%||Selenium (Se):|≤0.003%||Density:|1.67||Storage and Stability:|Store at RT. Stable for 12 months after receipt. Hygroscopic||Meets or exceeds ACS Specifications.