Posted by Robyn on Tuesday, October 4, 2011 at 3:58pm.
To write net ionic equations you follow some rules. Some things that are written as molecules are
1. weak electrolytes (those that do not ionize 100% such as weak acids(those with a Ka), weak bases (those with a Kb), H2O, ETC.
b. insoluble materials (memorize the solubility rules). Here is a simplified set of rules. http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html
c.gases
Everything else is written as ions.
H2CO3(aq) + 2Li^+(aq) + 2OH^-(aq) ==>2H2O(l) + 2Li^+(aq) + CO3^2-(aq)
What I have written above is the ionic equation. To write the net ionic equation, we cancel any ions common to both sides. Therefore, we cancel 2Li^+(aq) and rewrite the net ionic equation as
H2CO3(aq) + 2OH^-(aq) ==>2H2O(l) + CO3^2-(aq)
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