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 pK2 E 7- Answer Bank a b d. e
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 pK2 E 7- Answer Bank a b d. e
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 image shows a graph depicting the titration of a polyprotic weak acid with a strong base. The task is to label specific points on the graph:
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
- **Graph Type**: Titration curve
- **Axes**:
- Vertical axis (y-axis): pH
- Horizontal axis (x-axis): Volume of titrant added (not labeled specifically)
- **Curve Characteristics**:
- The red curve represents the pH change as a strong base is added to the weak acid solution.
- There are distinct points on the curve (marked with boxes) corresponding to the positions where specific conditions (such as equivalence and half-equivalence points) occur.
- **Key Features**:
- The curve shows typical sigmoidal behavior of a titration curve with two inflection points.
- These inflection points likely correspond to the points where pH equals pKₐ values and where intermediate species are present in significant amounts.
### Answer Bank
There is an answer bank at the bottom with options labeled a, b, c, d, and e, corresponding to the labels required for the graph. These should be matched with the relevant points on the graph to complete the assignment.
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