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Ionic Compounds Using the Stock Naming System
 

When elements have more than one charge, it is important to distinguish which charge is being used. We will do this in the way we name the ion. This tutorial explains how to use the stock naming system.

  The Stock system or Stock's system was designed by Alfred Stock (German chemist 1876-1946), and first published in 1919. In his own words, he considered the system to be “simple, clear, immediately intelligible, capable of the most general application."

In 1924, a German commission recommended Stock's system to be adopted with some changes. For example, FeCl2, which would have been named iron(2)-chloride according to Stock's original idea, became iron(II) chloride in the revised proposal. In 1934, Stock approved of the Roman numerals, but felt it better to keep the hyphen and drop the parenthesis. This suggestion has not been followed, but the Stock system remains in use worldwide.


Alfred Stock

How to Write a Formula for an Ionic Compound using the Stock Naming System

Let’s try this one. Write the formula for copper(II) chloride.

Description of Action
Action
1. Write the symbol for the given cation name. 1. Cu
2. Use the number in parenthesis as the cations charge. Write it to the top right of the cation’s symbol. 2. Cu2+
3. To the right of the cation’s symbol and charge, write the anion and its charge. 3. Cu2+ Cl1-
4. Cross each element’s oxidation number to the lower right side of the other element’s symbol. 4. Cu2+ Cl1-
Result: Cu1- Cl2+
5. Remove all (+) signs, (-) signs and ones. 5. CuCl2
6. Reduce if necessary. Remember, if you are using a polyatomic ion, DO NOT touch anything in the parenthesis. 6. Not necessary: CuCl2
7. If you are using a polyatomic ion and there is no number outside of the parenthesis, you can remove the parenthesis. 7. No polyatomic ions: CuCl2

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