[sreynaga]

Ok, I am completely lost as to what to do.

I had a lab where we are testing ionic reactions.  For example I mixed cobalt nitrate with sodium phosphate, which turned the cobalt nitrate from pink to purple.  From there I was to write a balanced chemical equation.  My starting sloutions contained: Co(NO3)2 + Na3PO4 (all charges are equal) then I don't know what to get for the product or how to balance.  I think CoPO4 and NaNO3 are the products, but I don't know what the amount of each compound would be.  I can balance an equation if I know the reactants and the products, but I have no idea what to do from here.  Any help and some explanation would be greatly appreciated.

[Arkcon]

Are the molecules that make up your products charge balanced?  That is, correct numbers of anions and cations in the molecule?  You have a hint for the charge in the formulas of the products?
*[EDIT]* Written wrong, corrected below.

[sreynaga]

No hint, but yes charges have to be equal on both sides, I of course did the first side, but I got nothing for the second side.  Because we are testing for precipitates, they have to be uncharged compounds/molecules.  Oh and we have to specify if they are (aq) (s) or (l).  If any of this helps.  I'm pretty sure the sodium nitrate is soluble and the colbalt phosphate is not and is therefore the precipitate.

[sreynaga]

Also, if this helps any, 2 drops of cobalt nitrate and 2 drops of sodium phosphate were used.

[Arkcon]

Whoops, I wrote that wrong above, can you use the formulas for the reactants for hints on how to build the formulas of your products?