The Formulas that are hard for me to remember are the acids. A good way to remember an acd is that it has an H (hydrogen) at the front of it. The Acid also has to be balanced.
Example: Sulfate SO4
Add Hydrogen -> HSO4
Sulfates charge is -1 Hydrogen's charge is+1
So there is only one atom of sulfate and one of Hydrogen
Example: Phosphoric Acid
Phosphate: PO4
Phosphoric Acid: H3PO4
Since the charge on phosphate is -3, and the hydrogen +1 you have to have 3 hydrogen.
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