Hint for Naming Fe2(SO4)3 For Fe2(SO4)3 we have a transition metal and a polyatomic ion.
- Name the for Fe as it appears on the Periodic Table.
- Use the Common Ion Table to find the formula and charge for SO4.
- Look at the chemical formula to find the charge for Fe.
SO4-2, has a charge of -2. Since we have 3 or them the total charge is -6.
We have two Fe atoms. Each will need a charge of +3 to give a total charge of +6. (so the net charge for the compound is zero). To show that each Fe atom has a +3 charge we write (III) after the name for Fe.
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