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QUESTION

# Write the formula for iron (III) sulfate. What would this be?

"Ferric sulfate" has a formula of Fe_2(SO_4)_3

How did I formulate this? Well, I have ferric ion, Fe^(3+), and the sulfate ion, SO_4^(2-).

Clearly the salt is electrically neutral, so I take 2 of the ferric ion, "6 positive charges", and 3 of the sulfate ion, "6 negative charges".

Capisce?