How to write the formula for Nitrous acid (HNO2)

In this video we'll write the correct formula for Nitrous acid.

To write the formula for Nitrous acid we’ll use the Periodic Table, a Common Ion Table, and follow some simple rules.

Because Nitrous acid has a polyatomic ion (the group of non-metals after the metal) we’ll need to use a table of names for common polyatomic ions, in addition to the Periodic Table.


--Formula Writing Resources--

Finding Ionic Charge: Figuring out the Charge on Ions
Memorizing Polyatomic Ions: Memorizing and Using the List of Poly...
Criss-Cross Method: The Criss-Cross Method for Writing Ch...

For a complete tutorial on naming and formula writing for compounds, like Boric Acid and more, visit:  
http://www.breslyn.org/chemistry/naming

For a Common Ion Table:
http://www.thegeoexchange.org/chemist...


-- General Rules ---

If the name for the acid is:

Hydro + stem + ic
1.  Write H.
2.  Use the stem to find element name on the
               periodic table.
3. Balance the charges.

Stem + ic
1.  Write the ion: stem + ate
2.  Look up ion on Common Ion Table.
3.  Write H and then the ion formula.
4.  Balance the charges.

Stem + ous
1.  Write the ion: stem + ite
2.  Look up ion on Common Ion Table.
3.  Write H and then the ion formula.
4.  Balance the charges.
General Rules for Formula Writing for Acids
    (see Formula Writing for Acids: Explanatio...)

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