Buffer preparation: 18. Using a volumetric pipette, dispense 20.0 mL of a 0.10 M potassium dihydrogen phosphate (KH2PO4) solution into a clean, dry beaker. 19. Using a volumetric pipette, dispense 20.0 mL of 0.10 M NAOH solution into the same beaker. (This produces 40.0 mL of a 0.050 M solution of hydrogen phosphate ion, HPO,".) 20. Dispense a second 20.0 mL volume of potassium dihydrogen phosphate solution into a second clean, dry beaker. 21. Add 20.0 mL of deionized water to the beaker. (This produces 40.0 mL of a 0.050 M solution of dihydrogen phosphate ion, H;PO;.) 22. Mix the two solutions. (This will produce 80.0 mL of a buffer solution with [HPO,] = [H¿PO;] = 0.0250 M.) 23. Calculate the expected pH of the buffer. 24. Measure the pH using the pH meter.
Buffer preparation: 18. Using a volumetric pipette, dispense 20.0 mL of a 0.10 M potassium dihydrogen phosphate (KH2PO4) solution into a clean, dry beaker. 19. Using a volumetric pipette, dispense 20.0 mL of 0.10 M NAOH solution into the same beaker. (This produces 40.0 mL of a 0.050 M solution of hydrogen phosphate ion, HPO,".) 20. Dispense a second 20.0 mL volume of potassium dihydrogen phosphate solution into a second clean, dry beaker. 21. Add 20.0 mL of deionized water to the beaker. (This produces 40.0 mL of a 0.050 M solution of dihydrogen phosphate ion, H;PO;.) 22. Mix the two solutions. (This will produce 80.0 mL of a buffer solution with [HPO,] = [H¿PO;] = 0.0250 M.) 23. Calculate the expected pH of the buffer. 24. Measure the pH using the pH meter.
Chemistry
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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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Calculate the expected pH of the buffer.
Transcribed Image Text:**Buffer System Table**
| Buffer | Beakers | 0.1 M KH2PO4 | 0.1 M NaOH | DI | pH Meter | Calculated pH |
|--------|---------|--------------|------------|----|----------|---------------|
| 1 | A | 20 mL | 20 mL | - | 6.8 | |
| | B | 20 mL | - | 20 mL | | |
**Explanation:**
This table illustrates the preparation and measurement of a buffer system. It explores the use of potassium dihydrogen phosphate (KH2PO4) and sodium hydroxide (NaOH) in buffer solutions, with distilled water (DI) as a part of the diluent system. The pH level is measured directly using a pH meter, while calculated pH values seem to be left blank, indicating a possible area for future calculations or additional data input.
![### Buffer Preparation Procedure
1. **Dispense Solution:**
- Using a volumetric pipette, dispense 20.0 mL of a 0.10 M potassium dihydrogen phosphate (KH₂PO₄) solution into a clean, dry beaker.
2. **Prepare Buffer:**
- Using a volumetric pipette, dispense 20.0 mL of a 0.10 M NaOH solution into the same beaker.
- *This produces 40.0 mL of a 0.050 M solution of hydrogen phosphate ion, \( \text{HPO}_4^{2-} \).*
3. **Second Solution Preparation:**
- Dispense a second 20.0 mL volume of potassium dihydrogen phosphate solution into a second clean, dry beaker.
4. **Dilute with Water:**
- Add 20.0 mL of deionized water to the beaker.
- *This produces 40.0 mL of a 0.050 M solution of dihydrogen phosphate ion, \( \text{H}_2\text{PO}_4^- \).*
5. **Mix Solutions:**
- Mix the two solutions.
- *This will produce 80.0 mL of a buffer solution with \([\text{HPO}_4^{2-}] = [\text{H}_2\text{PO}_4^-] = 0.0250 \, \text{M}\).*
6. **pH Calculation and Measurement:**
- Calculate the expected pH of the buffer.
- Measure the pH using a pH meter.
This procedure outlines the steps to prepare a phosphate buffer by mixing solutions of potassium dihydrogen phosphate and sodium hydroxide, followed by measurement and verification of the buffer's pH.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F290e4581-ac4b-484d-9123-17cd55051d66%2Ff95939a0-6fe5-4d79-8c8e-7e8e76f1bfb3%2Fowz9xvo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:### Buffer Preparation Procedure
1. **Dispense Solution:**
- Using a volumetric pipette, dispense 20.0 mL of a 0.10 M potassium dihydrogen phosphate (KH₂PO₄) solution into a clean, dry beaker.
2. **Prepare Buffer:**
- Using a volumetric pipette, dispense 20.0 mL of a 0.10 M NaOH solution into the same beaker.
- *This produces 40.0 mL of a 0.050 M solution of hydrogen phosphate ion, \( \text{HPO}_4^{2-} \).*
3. **Second Solution Preparation:**
- Dispense a second 20.0 mL volume of potassium dihydrogen phosphate solution into a second clean, dry beaker.
4. **Dilute with Water:**
- Add 20.0 mL of deionized water to the beaker.
- *This produces 40.0 mL of a 0.050 M solution of dihydrogen phosphate ion, \( \text{H}_2\text{PO}_4^- \).*
5. **Mix Solutions:**
- Mix the two solutions.
- *This will produce 80.0 mL of a buffer solution with \([\text{HPO}_4^{2-}] = [\text{H}_2\text{PO}_4^-] = 0.0250 \, \text{M}\).*
6. **pH Calculation and Measurement:**
- Calculate the expected pH of the buffer.
- Measure the pH using a pH meter.
This procedure outlines the steps to prepare a phosphate buffer by mixing solutions of potassium dihydrogen phosphate and sodium hydroxide, followed by measurement and verification of the buffer's pH.
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