The graph shows the titration of a polyprotic weak acid with a strong base. Label the following points. a. the point where the pH corresponds to a solution of H, A in water b. the point where the pH corresponds to a solution of HA in water c. the point where the pH corresponds to a solution of A2- in water d. the point where pH equals pKal e. the point where pH equals pKa2 Answer Bank a b d. e Titrant (mL)
The graph shows the titration of a polyprotic weak acid with a strong base. Label the following points. a. the point where the pH corresponds to a solution of H, A in water b. the point where the pH corresponds to a solution of HA in water c. the point where the pH corresponds to a solution of A2- in water d. the point where pH equals pKal e. the point where pH equals pKa2 Answer Bank a b d. e Titrant (mL)
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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Transcribed Image Text:The graph shows the titration of a polyprotic weak acid with a strong base. Label the following points.
a. the point where the pH corresponds to a solution of H₂A in water
b. the point where the pH corresponds to a solution of HA⁻ in water
c. the point where the pH corresponds to a solution of A²⁻ in water
d. the point where pH equals pKₐ₁
e. the point where pH equals pKₐ₂
**Graph Description:**
- **Axes:**
- The vertical axis represents pH, starting from approximately 0 and extending upwards. Important positions, such as pH 7, are marked on the axis.
- The horizontal axis represents the volume of titrant added, measured in milliliters (mL).
- **Titration Curve:**
- The red curve illustrates the change in pH as titrant is added.
- Initially, the curve is relatively flat and then rises steeply, indicating the endpoint of the first deprotonation.
- It then levels off, rises again more steeply, signaling the endpoint of the second deprotonation, and finally levels off again.
- **Points of Interest:**
- Along the curve, there are several points marked with dotted lines leading to squares labeled with letters (a to e).
- These points correspond to specific stages in the titration process, specifically where the solution is predominantly in the form of H₂A, HA⁻, or A²⁻, and where the pH is equal to the acid dissociation constants (pKₐ₁ and pKₐ₂).
**Answer Bank:**
- Labels: a, b, c, d, e.
Each label from the answer bank corresponds to the specific points identified along the titration curve as described above.
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