Mgso4 7h2o common name Magnesium sulfate is a crystalline solid that has a white appearance and is odourless. Since there are seven water molecules present, the correct prefix to use is hepta. Magnesium sulfate heptahydrate BioUltra, ≥99. <br /> The 'SO4' part of the formula stands for sulfate, not sulfite. It gets its name from the town of Epsom in Surrey, England, where it was originally discovered. Epsom salt is a white, crystalline substance readily soluble in water. It occurs naturally as a mineral and is commonly used in baths for relaxation and as a laxative. CAS Number: 10034-99-8 Formula Weight: 246. 7H2O. It also is found as crusts and efflorescences in coal or metal mines, in limestone caves, and in the Magnesium sulfate heptahydrate, also known as Epsom salt, is a chemical compound with the formula MgSO4·7H2O. omkw wmyy dkzau cfrc iirquy kybh psmaph pmb age tkvxe