EDTA is used as a complexing agent in chemical analysis. Solutions of EDTA, usually containing the disodium salt Na2H2EDTA, are also used to treat heavy metal poisoning. The equilibrium constant for the following reaction is 6.7 × 1021:
Calculate [Pb2+] at equilibrium in a solution originally 0.0050 M in Pb2+, 0.075 M in H2EDTA2−, and buffered at pH = 7.00.
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