Rate this calculator
0.0
/5
(0 ratings)
Be the first to rate.
Your rating
You can update your rating any time.
Naming Salts with Polyatomic Ions
General Chemistry • Chemical Compounds
Frequently Asked Questions
How do you name an ionic salt with a polyatomic ion?
Name the cation first and the anion second, using the standard polyatomic ion name (such as sulfate or nitrate). If the metal can have multiple charges, include a Roman numeral to show its oxidation state.
When do I need parentheses in formulas like Fe2(SO4)3?
Parentheses are used when a polyatomic ion repeats more than once in the formula. The subscript outside the parentheses multiplies every atom inside the polyatomic ion.
How does the calculator determine the Roman numeral for a metal in a salt?
It uses charge balance: the total positive charge from the cation(s) must equal the total negative charge from the anion(s). The metal oxidation state is the charge that makes the overall compound neutral.
What is ammonium and how is it named in salts?
Ammonium is the polyatomic cation NH4+ and is named "ammonium" in the compound name. For example, (NH4)2CO3 is ammonium carbonate.
Does this calculator work for molecular (covalent) compounds?
No, it is designed for ionic salts that contain ions, including polyatomic ions. Binary molecular compounds of nonmetals use Greek-prefix naming rules instead.