Lead Poisoning Used to Be Treated by Injections of Ethylenediaminetetraacetic

question 17

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 Pb^2 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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