Question #1
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Question #1 and #2
![## CHEM 1131: Buffer Systems
### Instructor: [Insert Instructor Name]
**Date:** [Insert Date]
---
**Lower pH change = pH after addition - initial pH.**
Note: If the answer is negative, pH goes down.
---
### Data
**Mass of NaCl needed for 50.0 mL of 0.200 M NaCl solution**
(Show calculation below.)
\[ 50.0 \, \text{mL} \times \frac{1 \, \text{L}}{1000 \, \text{mL}} \times 0.200 \, \text{mol/L NaCl} \times \frac{58.44 \, \text{g}}{1 \, \text{mol NaCl}} \]
---
### Table
| Solution | Initial pH | pH after addition of strong acid | Change in pH from initial | pH after addition of strong base | Change in pH from initial |
|-------------------|------------|---------------------------------|---------------------------|----------------------------------|---------------------------|
| Water | 7.04 | 2.43 | -4.61 | 11.77 | +4.73 |
| 0.200 M NaCl | 7.08 | 2.46 | -4.62 | 11.82 | +4.74 |
| Acetate Buffer | 4.66 | 4.60 | -0.06 | 4.74 | +0.08 |
| Phosphate Buffer | 6.67 | 6.62 | -0.05 | 6.71 | +0.04 |
---
**Note:** Changes in pH after adding strong acid or base indicate buffering capacity. A smaller change suggests better buffering.
---
### Questions
1. **Do chloride or sodium ions have a big effect on pH? What is the evidence that supports your answer?**
*Hint: Compare the initial pH values of water and 0.200 M NaCl.*
- [Write your answer here]
2. **Is the 0.200 M NaCl solution buffered or not? What is the evidence that supports your answer?**
*Compare the pH changes for the](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9a9a91fe-3af7-4791-b7e3-8b1b36998cbe%2F1ecba6e4-db8a-43f0-b5f4-7851e191f76c%2Fszqbwfg_processed.jpeg&w=3840&q=75)
Transcribed Image Text:## CHEM 1131: Buffer Systems
### Instructor: [Insert Instructor Name]
**Date:** [Insert Date]
---
**Lower pH change = pH after addition - initial pH.**
Note: If the answer is negative, pH goes down.
---
### Data
**Mass of NaCl needed for 50.0 mL of 0.200 M NaCl solution**
(Show calculation below.)
\[ 50.0 \, \text{mL} \times \frac{1 \, \text{L}}{1000 \, \text{mL}} \times 0.200 \, \text{mol/L NaCl} \times \frac{58.44 \, \text{g}}{1 \, \text{mol NaCl}} \]
---
### Table
| Solution | Initial pH | pH after addition of strong acid | Change in pH from initial | pH after addition of strong base | Change in pH from initial |
|-------------------|------------|---------------------------------|---------------------------|----------------------------------|---------------------------|
| Water | 7.04 | 2.43 | -4.61 | 11.77 | +4.73 |
| 0.200 M NaCl | 7.08 | 2.46 | -4.62 | 11.82 | +4.74 |
| Acetate Buffer | 4.66 | 4.60 | -0.06 | 4.74 | +0.08 |
| Phosphate Buffer | 6.67 | 6.62 | -0.05 | 6.71 | +0.04 |
---
**Note:** Changes in pH after adding strong acid or base indicate buffering capacity. A smaller change suggests better buffering.
---
### Questions
1. **Do chloride or sodium ions have a big effect on pH? What is the evidence that supports your answer?**
*Hint: Compare the initial pH values of water and 0.200 M NaCl.*
- [Write your answer here]
2. **Is the 0.200 M NaCl solution buffered or not? What is the evidence that supports your answer?**
*Compare the pH changes for the
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