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For example, FeSO 4 is named iron(2+) sulfate (with the 2+ charge on the Fe2+ ions balancing the 2â charge on the sulfate ion), whereas Fe 2 (SO 4) 3 is named iron(3+) sulfate (because the two iron ions in each formula unit each have a charge of 3+, to balance the 2â on each of the three sulfate ions).
Answers. Best Answer: My answers were: S in H2SO3 is 4+ S in MgSO4 is 6+ and S in K2S is 2- For the first one, hydrogen has an oxidation number of 1+ per atom. There are 2 hydrogen atoms in that compound so the overall charge of hydrogen is 2+. The oxidation number of oxygen is 2- per atom, and having 3 atoms of oxygen the overall charge of oxygen is 6- so combine the charges.