A 56.0 mL volume of 0.25 M HBr is titrated with 0.50 M KOH. Calculate the pH after addition of 28.0 mL of KOH at 25 °C.

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Chapter1: Chemical Foundations
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**Titration Curve Explanation**

This graph represents a titration curve, which is a plot of pH against the volume of titrant added—in this case, 0.100 M NaOH. The horizontal axis represents the volume of NaOH added in milliliters (mL), ranging from 0 to 80 mL. The vertical axis shows the pH of the solution, with values ranging from 0 to 14.

**Key Features:**

- **Initial Region:** At the beginning, the pH is very low, indicating an acidic solution. This section of the curve is relatively flat, showing that the pH does not change significantly with the addition of the titrant at first.

- **Equivalence Point:** As NaOH is added, the curve rises steeply, indicating a rapid change in pH. The equivalence point is marked on the graph at around 40 mL, where the amount of acid equals the amount of base added. At this point, the pH is around 7, which is typical for a strong acid-strong base titration.

- **Final Region:** After the equivalence point, the curve levels off again, showing that further additions of NaOH result in slower changes in pH. The solution becomes basic as more base is added.

This titration curve effectively illustrates the neutralization of an acid by a base, with a clear equivalence point where the pH rapidly changes, demonstrating the characteristic 'S' shape of a strong acid-strong base titration.
Transcribed Image Text:**Titration Curve Explanation** This graph represents a titration curve, which is a plot of pH against the volume of titrant added—in this case, 0.100 M NaOH. The horizontal axis represents the volume of NaOH added in milliliters (mL), ranging from 0 to 80 mL. The vertical axis shows the pH of the solution, with values ranging from 0 to 14. **Key Features:** - **Initial Region:** At the beginning, the pH is very low, indicating an acidic solution. This section of the curve is relatively flat, showing that the pH does not change significantly with the addition of the titrant at first. - **Equivalence Point:** As NaOH is added, the curve rises steeply, indicating a rapid change in pH. The equivalence point is marked on the graph at around 40 mL, where the amount of acid equals the amount of base added. At this point, the pH is around 7, which is typical for a strong acid-strong base titration. - **Final Region:** After the equivalence point, the curve levels off again, showing that further additions of NaOH result in slower changes in pH. The solution becomes basic as more base is added. This titration curve effectively illustrates the neutralization of an acid by a base, with a clear equivalence point where the pH rapidly changes, demonstrating the characteristic 'S' shape of a strong acid-strong base titration.
Title: Acid-Base Titration

Description: In this exercise, a 56.0 mL volume of 0.25 M Hydrobromic acid (HBr) is titrated with 0.50 M Potassium hydroxide (KOH). The task is to calculate the pH after the addition of 28.0 mL of KOH at 25 °C.

Instructions:
1. **Express the pH Numerically:**
   - Use the provided information to perform the necessary calculations to find the pH.
   - Input the numerical value of the pH in the designated field.

Hints:
- Click "View Available Hint(s)" for guidance on the problem-solving steps.

Additional Tools:
- The interface provides options for formatting solutions, which include basic math and chemistry symbols. Use these tools if necessary to present your answer clearly.

Answer Entry:
- A text box is provided for entering the calculated pH value.

Note: Ensure to follow the stoichiometry of the reaction and account for any excess reactants or products formed during titration.
Transcribed Image Text:Title: Acid-Base Titration Description: In this exercise, a 56.0 mL volume of 0.25 M Hydrobromic acid (HBr) is titrated with 0.50 M Potassium hydroxide (KOH). The task is to calculate the pH after the addition of 28.0 mL of KOH at 25 °C. Instructions: 1. **Express the pH Numerically:** - Use the provided information to perform the necessary calculations to find the pH. - Input the numerical value of the pH in the designated field. Hints: - Click "View Available Hint(s)" for guidance on the problem-solving steps. Additional Tools: - The interface provides options for formatting solutions, which include basic math and chemistry symbols. Use these tools if necessary to present your answer clearly. Answer Entry: - A text box is provided for entering the calculated pH value. Note: Ensure to follow the stoichiometry of the reaction and account for any excess reactants or products formed during titration.
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