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Which is the principle species in EDTA solution at pH 7? H2Y2- H4Y H3Y- HY3- Y4-

Which is the principle species in EDTA solution at pH 7? H2Y2- H4Y H3Y- HY3- Y4-

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Which is the principle species in EDTA solution at pH 7?

  1. H2Y2-
  2. H4Y
  3. H3Y-
  4. HY3-
  5. Y4-
The image shows a graph of fractional composition versus pH for a multi-proton system. It illustrates the various protonation states of a substance, marked as \( \text{H}_6\text{Y}^{2+} \), \( \text{H}_5\text{Y}^{+} \), \( \text{H}_4\text{Y} \), \( \text{H}_3\text{Y}^{-} \), \( \text{H}_2\text{Y}^{2-} \), \( \text{HY}^{3-} \), and \( \text{Y}^{4-} \). ### Composition Details: - Each curve represents the fractional composition of a specific species as a function of pH. - The y-axis represents the fractional composition ranging from 0 to 1. - The x-axis represents the pH level ranging from 0 to 14. ### Specifics on Graph: - At low pH values, \( \text{H}_6\text{Y}^{2+} \) is predominant. - As the pH increases, \( \text{H}_5\text{Y}^{+} \) becomes more significant, followed by \( \text{H}_4\text{Y} \). - With further pH increase, \( \text{H}_3\text{Y}^{-} \), and subsequently \( \text{H}_2\text{Y}^{2-} \), dominate, peaking at moderate pH levels. - Between pH 7 and 9, \( \text{HY}^{3-} \) is the major species. - At high pH values, \( \text{Y}^{4-} \) becomes the main species, indicating deprotonation. ### pK Values: - The graph highlights two pK values: - \( pK_5 \) appears between pH 6 and 7, marking a point of equilibrium shift between species. - \( pK_6 \) is indicated between pH 9 and 10, showing another significant shift. This diagram is useful for visualizing the speciation of a compound across different pH levels, essential for understanding chemical equilibria in various environments.
Transcribed Image Text:The image shows a graph of fractional composition versus pH for a multi-proton system. It illustrates the various protonation states of a substance, marked as \( \text{H}_6\text{Y}^{2+} \), \( \text{H}_5\text{Y}^{+} \), \( \text{H}_4\text{Y} \), \( \text{H}_3\text{Y}^{-} \), \( \text{H}_2\text{Y}^{2-} \), \( \text{HY}^{3-} \), and \( \text{Y}^{4-} \). ### Composition Details: - Each curve represents the fractional composition of a specific species as a function of pH. - The y-axis represents the fractional composition ranging from 0 to 1. - The x-axis represents the pH level ranging from 0 to 14. ### Specifics on Graph: - At low pH values, \( \text{H}_6\text{Y}^{2+} \) is predominant. - As the pH increases, \( \text{H}_5\text{Y}^{+} \) becomes more significant, followed by \( \text{H}_4\text{Y} \). - With further pH increase, \( \text{H}_3\text{Y}^{-} \), and subsequently \( \text{H}_2\text{Y}^{2-} \), dominate, peaking at moderate pH levels. - Between pH 7 and 9, \( \text{HY}^{3-} \) is the major species. - At high pH values, \( \text{Y}^{4-} \) becomes the main species, indicating deprotonation. ### pK Values: - The graph highlights two pK values: - \( pK_5 \) appears between pH 6 and 7, marking a point of equilibrium shift between species. - \( pK_6 \) is indicated between pH 9 and 10, showing another significant shift. This diagram is useful for visualizing the speciation of a compound across different pH levels, essential for understanding chemical equilibria in various environments.
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