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How to Write the Formula for Iron (III) sulfate

Learning to name chemical compounds requires that you:

  • Determine the type of compound you are working with.
  • Apply the rules for naming that type of compound.
  • Practice until it becomes second nature.
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Get more practice writing formulas for compounds.

For Iron (III) sulfate use the hints and resources below to help write the formula.

Hint for Writing the Formula for Iron (III) sulfate

For Iron (III) sulfate we have a transition metal and a polyatomic ion.

This one is a bit tougher than the others.
  • Write the element symbol for Iron.
  • Use the Common Ion Table to find the formula and charge for the sulfate ion.
  • The (III) tells us that Iron has a charge of +3. The sulfate ion is -2.
    To make this we'll need two Iron atoms to give us a total of +6 on the iron. Then we can have three sulfate ions which gives us a -6 charge.
  • When you have more than one polyatomic ion use parentheses!
Note you can use the criss-cross method to check your work.
Iron (III) sulfate Resources