Concept explainers
Ethylenediaminetetraacetate (EDTA4− ) is used as a complexing agent in chemical analysis with the structure shown in Fig. 21.7. Solutions of EDTA4− are used to treat heavy metal poisoning by removing the heavy metal in the form of a soluble complex ion. The complex ion virtually prevents the heavy metal ions from reacting with biochemical systems. The reaction of EDTA4− with Pb2+ is
Pb2+(aq) + EDTA4−(aq) ⇌ iPbEDTA2−(aq) K = 1.1 × 1018
Consider a solution with 0.010 mol of Pb(NO3)? added to 1.0 L of an aqueous solution buffered at pH = 13.00 and containing 0.050 M Na1EDTA. Does Pb(OH)2 precipitate from this solution? [Ksp for Pb(OH)2 = 1.2 × 10−15.
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Chapter 21 Solutions
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