# What is the formula for magnesium sulfate heptahydrate?

Mar 12, 2018

$M g S {O}_{4} \cdot 7 {H}_{2} O$

#### Explanation:

Magnesium is $M g$, which carries a +2 charge
Sulphate is $S {O}_{4}$, which carries a -2 charge.

Hence, magnesium sulphate is $M g S {O}_{4}$.

"Hepta-" refers to "seven", "hydrate" refers to "water", so we have to add $7 {H}_{2} O$.

Formula: $M g S {O}_{4} \cdot 7 {H}_{2} O$