determine the molarity of each of the ions present in the following aqueous salt solutions

Question

1.20M MgSO4

Answer 1

You have 1 Mg ion in a molecule of MgSO4; therefore, M Mg ion = M MgSO4.
You have 1 SO4 in in a molecule of MgSO4; therefore, M SO4 = M MgSO4.