Lead poisoning used to be treated by injections of ethylenediaminetetraacetic acid, EDTA. If the concentration of EDTA in the blood of a patient is 3.0*10-9 M and the formation constant for Pb(EDTA) 2- is 2.0 * 1018, what is the concentration ratio of free toxic Pb2+ to lead-EDTA complex in the blood?
A) 2.0 *10-11
B) 1.7 *10-10
C) 2.0 * 10-9
D) 5.0 * 10-19
E) 3.0 * 10-9
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