General Chemistry: Principles and Modern Applications (10th Edition)

Published by Pearson Prentice Hal
ISBN 10: 0132064529
ISBN 13: 978-0-13206-452-1

Chapter 24 - Complex Ions and Coordination Compounds - 24-7 Concept Assessment - Page 1095: 24-7

Answer

$[\mathrm{Cr}(\mathrm{EDTA})]^{-}$ form chelates in a single step, while $\left[\mathrm{Cr}(\text { en })_{3}\right]^{3+}$ form chelates in three steps. The $\beta_{1}$ for $[\mathrm{Cr}(\text { EDTA })]^{-}$ is much greater than $\beta_{1}$ or $\beta_{2}$ of $\left[\mathrm{Cr}(\mathrm{en})_{3}\right]^{3+},$ but the cumulative formation constant, $\beta_{3}\left(\text { or } K_{\mathrm{f}}\right),$ of $\left[\mathrm{Cr}(\mathrm{en})_{3}\right]^{3+}$ is similar to $\beta_{1}\left(\text { or } K_{\mathrm{f}}\right)$of $[\mathrm{Cr}(\mathrm{EDTA})]^{-}$.

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