Lead Poisoning Used to Be Treated by Injections of Ethylenediaminetetraacetic

question 5

Multiple Choice

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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