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At which point in the titration is the pH solely dependent on the excess strong base? 13 12 11 10 9- 7 6 5 A 0.005 B 0.01 0.015 C 0.025 Volume of Titrant Added (L) 0.035 D 0.045

At which point in the titration is the pH solely dependent on the excess strong base? 13 12 11 10 9- 7 6 5 A 0.005 B 0.01 0.015 C 0.025 Volume of Titrant Added (L) 0.035 D 0.045

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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### Titration Curve Analysis #### Understanding the pH Dependence During Titration The graph presents a titration curve, plotting pH against the volume of titrant added in liters (L). The horizontal axis represents the volume of titrant added, while the vertical axis represents the pH of the solution. The curve is segmented into several notable points, labeled A, B, C, and D, which represent different stages of the titration process. 1. **Point A:** - At this initial stage, the pH is approximately 3. This indicates the initial acidity of the solution before any strong base titrant is added. - Volume of titrant added: 0 L. 2. **Point B:** - As titrant is gradually added, the pH begins to rise slowly. This segment indicates the buffer region where the pH changes are relatively minimal even though the volume of titrant increases. - Volume of titrant added: approximately between 0.005 L and 0.015 L. 3. **Point C:** - This is the equivalence point where the amount of titrant added is stoichiometrically equivalent to the amount of analyte in the solution. Here, there's a significant and steep rise in pH. - Volume of titrant added: approximately 0.02 L. - The pH jumps from around 7 to 11, a rapid transition indicating the neutralization reaction reaching completion. 4. **Point D:** - Beyond the equivalence point, any additional titrant added leads to a slower increase in pH. During this stage, the pH is primarily determined by the excess strong base in the solution. - Volume of titrant added: beyond 0.03 L. - This stage is characterized by a relatively flat curve, indicating the solution has become predominantly basic, with pH values around 13. ### Conclusion The graph visually demonstrates the different phases encountered during titration: the initial acidic region (A), buffer region (B), equivalence point (C), and post-equivalence region (D). The question posed in the graph: "At which point in the titration is the pH solely dependent on the excess strong base?" refers to point D. At this stage, the pH of the solution is mainly influenced by the amount of strong base added beyond the equivalence point. This understanding is essential in analytical
Transcribed Image Text:### Titration Curve Analysis #### Understanding the pH Dependence During Titration The graph presents a titration curve, plotting pH against the volume of titrant added in liters (L). The horizontal axis represents the volume of titrant added, while the vertical axis represents the pH of the solution. The curve is segmented into several notable points, labeled A, B, C, and D, which represent different stages of the titration process. 1. **Point A:** - At this initial stage, the pH is approximately 3. This indicates the initial acidity of the solution before any strong base titrant is added. - Volume of titrant added: 0 L. 2. **Point B:** - As titrant is gradually added, the pH begins to rise slowly. This segment indicates the buffer region where the pH changes are relatively minimal even though the volume of titrant increases. - Volume of titrant added: approximately between 0.005 L and 0.015 L. 3. **Point C:** - This is the equivalence point where the amount of titrant added is stoichiometrically equivalent to the amount of analyte in the solution. Here, there's a significant and steep rise in pH. - Volume of titrant added: approximately 0.02 L. - The pH jumps from around 7 to 11, a rapid transition indicating the neutralization reaction reaching completion. 4. **Point D:** - Beyond the equivalence point, any additional titrant added leads to a slower increase in pH. During this stage, the pH is primarily determined by the excess strong base in the solution. - Volume of titrant added: beyond 0.03 L. - This stage is characterized by a relatively flat curve, indicating the solution has become predominantly basic, with pH values around 13. ### Conclusion The graph visually demonstrates the different phases encountered during titration: the initial acidic region (A), buffer region (B), equivalence point (C), and post-equivalence region (D). The question posed in the graph: "At which point in the titration is the pH solely dependent on the excess strong base?" refers to point D. At this stage, the pH of the solution is mainly influenced by the amount of strong base added beyond the equivalence point. This understanding is essential in analytical
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