Ethylenediaminetetraacetic acid (abbreviated H4EDTA) is a tetraprotic acid. Its salts

Chapter 19, Problem 19.144

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Ethylenediaminetetraacetic acid (abbreviated H4EDTA) is a tetraprotic acid. Its salts are used to treat toxic metal poisoning by forming soluble complex ions that are then excreted. Because EDTA42 also binds essential calcium ions, it is often administered as the calcium disodium salt. For example, when Na2Ca(EDTA) is given to a patient, the [Ca(EDTA)]22 ions react with circulating Pb21 ions and the metal ions are exchanged: 3Ca(EDTA)4 22(aq) 1 Pb21(aq) BA 3Pb(EDTA)4 22(aq) 1 Ca21(aq) Kc 5 2.53107 A child has a dangerous blood lead level of 120 mg/100 mL. If the child is administered 100. mL of 0.10 M Na2Ca(EDTA), assuming the exchange reaction and excretion process are 100% efficient, what is the final concentration of Pb21 in mg/100 mL blood? (Total blood volume is 1.5 L.)

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