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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**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 = _______ 

---

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.
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 = _______ --- 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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