Chemistry Practice Problems Polyatomic Ions Practice Problems Solution: Determine the subscript for ammonium in the chemic...

Solution: Determine the subscript for ammonium in the chemical formula for ammonium dichromate?

Problem

Determine the subscript for ammonium in the chemical formula for ammonium dichromate?

Solution

We are asked to determine the subscript of ammonium in the chemical formula of an ionic compound with polyatomics, ammonium dichromate.


A binary ionic compound with polyatomics has the following features:

  • A metal or a positive polyatomic species (Cation)
  • A nonmetal or negative polyatomic species (Anion)


Rules for Naming:

1. The metal or the positive polyatomic species is named and written first.

If the metal is a transition metal, we must use a Roman Numeral to describe its positive charge.


2. The nonmetal retains its base name followed by the suffix -ide while the negative polyatomic species retains its name.

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