EDTA can form up to ___ species in aqueous solution. Explain which of these species is the most reactive form of EDTA toward metal ions and the pH at which it is the dominant species in solution? Question 8 Select one: a. 7 b. 4 c. 3 d. 0 e. 8
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EDTA is a hexadentate ligand, meaning it can bind to metal ions at six different sites. In aqueous solution, it can exist in various protonation states depending on the pH. Show more…
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Ethylenediaminetetraacetic acid (EDTA; C10H16N2O8) is an important compound in analytical chemistry due to its role as a hexadentate ligand capable of chelating (forming ≥ 2 coordinate bonds) with metal ions, effectively quenching their reactivity in solution. EDTA has many labile protons, each with a different acidity. Given the following Ka values, what is the major expected charge of an EDTA molecule in solution at pH 7? Ka CO2H 1.0 CO2H 3.16E-02 CO2H 1.00E-02 CO2H 2.04E-03 NH 7.41E-07 NH 4.27E-11 A. 0 B. -1 C. -2 D. -3 E. -4
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What is the predominant form of EDTA at pH 5? a. H3Y- b. H2Y2- c. HY3- d. Y4-
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How many EDTA (ethylenediamine-tetraacetic acid) molecules are required to make an octahedral complex with a $\mathrm{Ca}^{2+}$ ion? (a) $\operatorname{Six}$ (b) Three (c) One (d) Two
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