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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 pK al e. the point where pH equals pK a2 거 b Titrant (mL) O d Answer Bank

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 pK al e. the point where pH equals pK a2 거 b Titrant (mL) O d Answer Bank

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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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**The graph shows the titration of a polyprotic weak acid with a strong base. Label the following points.** 1. **a:** The point where the pH corresponds to a solution of \( \text{H}_2\text{A} \) in water 2. **b:** The point where the pH corresponds to a solution of \( \text{HA}^- \) in water 3. **c:** The point where the pH corresponds to a solution of \( \text{A}^{2-} \) in water 4. **d:** The point where pH equals \( \text{p}K_{a1} \) 5. **e:** The point where pH equals \( \text{p}K_{a2} \) **Graph Details:** - **Axes:** - **x-axis:** Titrant (mL) - **y-axis:** pH, with a marked level at around 7. - **Curve:** The graph shows a titration curve with two distinct buffering regions and equivalence points. The curve starts from a lower pH, gradually rises with two plateaus, and approaches a higher pH. - **Labeled Points:** - **a:** Near the beginning of the curve, indicating the presence of \( \text{H}_2\text{A} \) - **b:** Before the first plateau, indicating \( \text{HA}^- \) - **c:** After the second equivalence point, indicating \( \text{A}^{2-} \) - **d:** At the first plateau, corresponding to \( \text{p}K_{a1} \) - **e:** At the second plateau, corresponding to \( \text{p}K_{a2} \) The curve is typical of a polyprotic acid being titrated with a strong base, showing characteristic multi-step neutralization points.
Transcribed Image Text:**The graph shows the titration of a polyprotic weak acid with a strong base. Label the following points.** 1. **a:** The point where the pH corresponds to a solution of \( \text{H}_2\text{A} \) in water 2. **b:** The point where the pH corresponds to a solution of \( \text{HA}^- \) in water 3. **c:** The point where the pH corresponds to a solution of \( \text{A}^{2-} \) in water 4. **d:** The point where pH equals \( \text{p}K_{a1} \) 5. **e:** The point where pH equals \( \text{p}K_{a2} \) **Graph Details:** - **Axes:** - **x-axis:** Titrant (mL) - **y-axis:** pH, with a marked level at around 7. - **Curve:** The graph shows a titration curve with two distinct buffering regions and equivalence points. The curve starts from a lower pH, gradually rises with two plateaus, and approaches a higher pH. - **Labeled Points:** - **a:** Near the beginning of the curve, indicating the presence of \( \text{H}_2\text{A} \) - **b:** Before the first plateau, indicating \( \text{HA}^- \) - **c:** After the second equivalence point, indicating \( \text{A}^{2-} \) - **d:** At the first plateau, corresponding to \( \text{p}K_{a1} \) - **e:** At the second plateau, corresponding to \( \text{p}K_{a2} \) The curve is typical of a polyprotic acid being titrated with a strong base, showing characteristic multi-step neutralization points.
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