In the titration curve below, what is the pH of the solution equal to at Point D? 14 Unknown Solution K2A B pH 6. 8. E F 25 50. 75 100. mL of 1.00 M HCl added m N - O

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In the titration curve below, what is the pH of the solution equal to at Point D?

![Titration Curve]

### Graph Explanation:

- **Title**: Unknown Solution = K₂A
- **Vertical Axis**: pH (from 0 to 14)
- **Horizontal Axis**: mL of 1.00 M HCl added (from 0 to 100 mL)

The graph represents a titration curve with several labeled points (A to F) indicating key stages:

- **Point A**: Initial pH of approximately 11.5 before the addition of HCl.
- **Point B**: Slight decrease in pH.
- **Point C**: Further decrease in pH, around pH 9.
- **Point D**: pH roughly 7.5, indicating a significant stage in the titration.
- **Point E**: pH about 3.5, nearing the endpoint.
- **Point F**: Final pH around 2.

### Multiple Choice Question:

- What does the pH at Point D correspond to?
  - ○ \( \text{pK}_{a_1} \) for H₂A
  - ○ \( \text{pK}_{a_2} \) for H₂A
  - ○ \( \text{pK}_{b_1} \) for A²⁻
  - ○ \( \text{pK}_{b_2} \) for A²⁻

This setup guides the interpretation of the titration curve at each stage, especially Point D.
Transcribed Image Text:In the titration curve below, what is the pH of the solution equal to at Point D? ![Titration Curve] ### Graph Explanation: - **Title**: Unknown Solution = K₂A - **Vertical Axis**: pH (from 0 to 14) - **Horizontal Axis**: mL of 1.00 M HCl added (from 0 to 100 mL) The graph represents a titration curve with several labeled points (A to F) indicating key stages: - **Point A**: Initial pH of approximately 11.5 before the addition of HCl. - **Point B**: Slight decrease in pH. - **Point C**: Further decrease in pH, around pH 9. - **Point D**: pH roughly 7.5, indicating a significant stage in the titration. - **Point E**: pH about 3.5, nearing the endpoint. - **Point F**: Final pH around 2. ### Multiple Choice Question: - What does the pH at Point D correspond to? - ○ \( \text{pK}_{a_1} \) for H₂A - ○ \( \text{pK}_{a_2} \) for H₂A - ○ \( \text{pK}_{b_1} \) for A²⁻ - ○ \( \text{pK}_{b_2} \) for A²⁻ This setup guides the interpretation of the titration curve at each stage, especially Point D.
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