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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).
Do All Ionic Compounds Dissolve? By virtue of the arrangement of the hydrogen atoms around the oxygen, each water molecule carries a polar charge. Its positive end is attracted to the negative ions in an ionic compound, while the negative end is attracted to the positive ions.