When a 15.4 mL sample of a 0.327 M aqueous hypochlorous acid solution is titrated with a 0.369 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration? pH =
When a 15.4 mL sample of a 0.327 M aqueous hypochlorous acid solution is titrated with a 0.369 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration? pH =
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:**Educational Content: Titration of Hypochlorous Acid**
**Question:**
When a 15.4 mL sample of a 0.327 M aqueous hypochlorous acid solution is titrated with a 0.369 M aqueous sodium hydroxide solution, what is the pH at the midpoint in the titration?
pH = _______
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This scenario describes a typical acid-base titration involving hypochlorous acid (a weak acid) and sodium hydroxide (a strong base). At the midpoint of a titration of a weak acid with a strong base, the pH is equal to the pKa of the weak acid, because the concentrations of the acid and its conjugate base are equal.
**Key Concepts:**
- **Titration:** A laboratory method where a solution of known concentration (titrant) is used to determine the concentration of an unknown solution (analyte).
- **Midpoint:** The stage in the titration where half of the acid has been neutralized by the base.
- **pKa:** A measure of acid strength, specifically the negative base-10 logarithm of the acid dissociation constant (Ka).
**Note:** To find the pH at the midpoint, one would typically use reference materials to determine the pKa of hypochlorous acid.
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