4. From the graph given in the previous question, determine the pKa of the acid used in the titration. Which of the following acids (HBrO, HN3, HClO, or HI) is the acid used? Explain how you know. The graph presented is titled "pH vs. Volume NaOH Added." It demonstrates the relationship between the pH level of a solution and the volume of sodium hydroxide (NaOH) added to it.### Graph Explanation:- **X-Axis (Horizontal)**: Represents the volume of NaOH added, ranging from 0.0 to 14.0 units.- **Y-Axis (Vertical)**: Represents the pH level of the solution, ranging from 3.00 to 14.00.### Key Observations:- At the beginning, the graph starts around a pH of 3. This indicates an acidic solution before the addition of NaOH.- As the NaOH is added, there's a gradual increase in pH, indicating the neutralization of the acidic solution.- Around the 8.0 volume mark, there is a sharp increase in pH, shifting from acidic to basic. This is the equivalence point where the amount of acid equals the amount of base.- After this point, the pH continues to rise gradually as more NaOH is added, indicating the solution is becoming increasingly basic. This graph illustrates a typical titration curve of a strong base (NaOH) being added to a strong acid, highlighting the neutralization process and the point where pH rapidly changes, known as the equivalence point.

Answered: . From the graph given in the previous…

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

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4. From the graph given in the previous question, determine the pKa of the acid used in the titration. Which of the following acids (HBrO, HN3, HClO, or HI) is the acid used? Explain how you know.

The graph presented is titled "pH vs. Volume NaOH Added." It demonstrates the relationship between the pH level of a solution and the volume of sodium hydroxide (NaOH) added to it.

### Graph Explanation:

- **X-Axis (Horizontal)**: Represents the volume of NaOH added, ranging from 0.0 to 14.0 units.
- **Y-Axis (Vertical)**: Represents the pH level of the solution, ranging from 3.00 to 14.00.

### Key Observations:

- At the beginning, the graph starts around a pH of 3. This indicates an acidic solution before the addition of NaOH.
- As the NaOH is added, there's a gradual increase in pH, indicating the neutralization of the acidic solution.
- Around the 8.0 volume mark, there is a sharp increase in pH, shifting from acidic to basic. This is the equivalence point where the amount of acid equals the amount of base.
- After this point, the pH continues to rise gradually as more NaOH is added, indicating the solution is becoming increasingly basic.

This graph illustrates a typical titration curve of a strong base (NaOH) being added to a strong acid, highlighting the neutralization process and the point where pH rapidly changes, known as the equivalence point.

Expert Solution

Step 1

Solution -

According to the question -

Given -

to determine pka and acid

pka is the pH of solution when exactly half of acid is neutralized.

Mean by ratio of acid to conjugate base = 1

Volume of base required to reach half the equivalence point = 8.0 / 2 = 4.0 ml

pH at 4.0 ml base volume = 7.5

So, pka of acid = 7.5

Acid is HClO because pka of HClO is 7.5

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