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Naming Ionic Compounds

Teaches students how to name ionic compounds given the formula and how to write the formula given the name

Melissa Betz

on 18 July 2013

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Transcript of Naming Ionic Compounds

Writing Names From Formulas
The goal of this section is that given a formula, you will be able to write the name of the compound
Naming Ionic Compounds: Background Knowledge
Before we can begin with the lesson you need to understand a few concepts.

1. Ionic compounds involve a metal and a non-metal
2. The metal is a cation (positive charge)
3. The non-metal is an anion (negative charge)

4. There are many common polyatomic ions, having those memorized will prove useful here
Writing a Formula from a Name
Let's See Some Examples!
Unit5.2 Naming Ionic Compounds

Polyatomic Ions
Step 1: Identify the Cation and Anion

Step 2: Write the names of the ions next to each other, cation first and changing the ending of the anion to -ide.

Step 3: If you have a transition metal or Sn, Pb, Bi, your next step is to check the charge. If you do not have a
transition metal, you're done!

Step 4: Check the charge in the cation and
write it as a roman numeral after
the name of the cation.

Now you are ready to work backwards!
Lets take a look at how to write a formula given the name of an ionic compound

Step 1: Identify the Cation and Anion

Step 2: Write the symbols for each (note: put any polyatomic ions in parentheses)

Step 3: Check the charge. (This comes from the periodic table or the roman numerals for transition metals)

Step 4: Criss-Cross the charges to make the subscripts for each ion

Example 1:
Lead (II) Nitrite
Example 2:
Magnesium Phosphate
Step 1: cation is Mg
anion is PO
Step 2: Mg (PO )
Step 3: Mg (PO )
magnesium has a +2 charge (from the periodic table)
and Phosphate has a -3 charge from the polyatomic chart
Step 4: criss-cross charges as subscripts
Mg (PO )
3 4 2
Example 3:
Sodium Sulfide
Sodium: Na which has a +1 charge
Sulfide: Sulfur, S, which has a -2 charge
Total cation charge is 1, while total
anion charge is -2 so we need 2 sodium
atoms to even out the charge
Na S
Example 4:
Lead (III) Hydroxide
Lead = Pb Hydroxide = (OH)
Charge on Pb = +3 Charge on (OH) = -1
to get positive and negative charges to match, we need 3 hydroxide ions
Ready to try it on your own?
Time to give it a go!
5. You should also have a working knowledge of determining common ion charges from the
periodic table (learned in unit 2)
Full transcript