How many moles of Pb(NO3)2 are required if 12 moles of Al(NO3)3 are produced?

1 Answer
Aug 20, 2016

3Pb(NO3)2(aq)+3Al2(SO4)3(aq)3PbSO4(s)+6Al(NO3)3(aq)

Explanation:

So if 12mol of aluminum nitrate are produced, clearly, from the stoichiometry of the given reaction, 6 mol of lead nitrate were required. But don't trust my arithmetic!

I chose aluminum sulfate because it is a fact that both lead nitrate and aluminum sulfate are reasonably soluble in aqueous solution, whereas lead sulfate is fairly insoluble. Lead sulfate should thus precipitate out. Lead can thus be separated from aluminum with this metathesis reaction.