Question

What is the formula for magnesium sulfate heptahydrate?

Answer 1

`MgSO_4*7H_2O`

Explanation:

Magnesium is `Mg`, which carries a +2 charge
Sulphate is `SO_4`, which carries a -2 charge.

Hence, magnesium sulphate is `MgSO_4`.

"Hepta-" refers to "seven", "hydrate" refers to "water", so we have to add `7H_2O`.

Formula: `MgSO_4*7H_2O`