# How do you name the foilowing compound: MgSO_4 * 7H_2O?

$\text{Magnesium sulfate heptahydrate.......}$
Anhydrous magnesium sulfate, $M g S {O}_{4}$ (aka in the lab as $\text{magsulf}$) is commonly used as a drying agent in phase extractions. It has next to no solubility in organic phases such as ether and methylene chloride. Why should this be important?