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# Ionic Equation watch

1. I need help getting the ionic equation for this:

Which is

Pb(NO3)2 + Na2CrO4 ----> 2NaNO3 + PbCrO4

2. Bung some state symbols into there, split the ionic substances up into their constituent ions (whilst leaving anything else well alone), and see what happens.
3. Pb2+ (NO3-)2 + Na+2Cr04,2- ---> 2Na+NO3- + Pb2+CrO4,2-

i think
4. Chromates (CrO42-) are usually insoluble. Exceptions include Na2CrO4, K2CrO4, (NH4)2CrO4, and MgCrO4.
The Na+, K+, and NH4+ ions form soluble salts.
The nitrate (NO3-) ion forms soluble salts

Pb(NO3)2 [aq] + Na2CrO4 [aq] ----> 2NaNO3 [aq] + PbCrO4 [strike]
Pb2+ [aq] + 2NO3- [aq] + 2Na+[aq] + CrO4 2-[aq] -----> 2Na+ [aq] + 2NO3-[aq] + PbCrO4[strike]

Left with
Pb2+ [aq] + CrO4 2-[aq] -----> PbCrO4[strike]

You see I'm not sure if lead chromate is soluble. According to http://chemed.chem.purdue.edu/genche...18/soluble.php it isn't. If it was soluble, then everything would be (aq) and so all ions would cancel each other out and you would have no net ionic equation.

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Updated: February 11, 2010
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