Posted by Alex on Wednesday, November 14, 2012 at 11:56pm.
I assume these are aqueous solutions.
First write and balance the molecular equation.
3Ca(NO3)2(aq) + 2Na3PO4(aq) ==> Ca3(PO4)2(s) + 6NaNO3
Then break these up into ions following these rules.
a. pure liquids are written as molecules.
b. gases are written as molecules
c. solids are written as molecules.
d. All others are written as ions.
3Ca^2+(aq) + 6NO3^-(aq) + 6Na^+(aq) + 2PO4^3-(aq) ==> Ca3(PO4)2(s) + 6Na^+(aq) + 6NO3^-(aq)
The above is the complete ionic equation. To change this to the net ionic equation, we cancel any ions that appear on both sides. So we can cancel 6Na^+(aq) and 6NO3^-(aq) which leaves us with
3Ca^2+(aq) + 2PO4^2-(aq) ==> Ca3(PO4)2(s)
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