A water supply company has been contaminated with a mixture of (Ba2+, Pb2+, Hg2+, Cr2+) from a nearby factory. One way to treat this problem is to precipitate out ALL the metals. They have called Environmental chemist Ms. Brothers to help solve this problem. a) Using your solubility table, help Ms. Brothers determine which anion should be used : carbonate or sulphate . Briefly explain why you choose that anion. b) Write the formula for the anion as a compound.
c) Write the net ionic equation for the formation of the solid compound containing Pb2+ and the anion you choose in (a)