Calibration of a glass electrode gave a reading of 139.3 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -160.7 mV with a 0.01 m borax buffer standard (pH = 9.139), both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed = What is the theoretical slope at 30 °C? slope theoretical What is the pH of an unknown that gives a reading of 42.5 mV with this electrode at 30 °C? pH = mV/pH mV/pH
Calibration of a glass electrode gave a reading of 139.3 mV with a 0.05 m potassium hydrogen phthalate buffer standard ( pH = 4.015), and a reading of -160.7 mV with a 0.01 m borax buffer standard (pH = 9.139), both measured at 30 °C. What is the observed slope (mV/pH unit) of the calibration curve? slope observed = What is the theoretical slope at 30 °C? slope theoretical What is the pH of an unknown that gives a reading of 42.5 mV with this electrode at 30 °C? pH = mV/pH mV/pH
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
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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![**Calibration of a Glass Electrode**
The calibration process of a glass electrode provided the following readings:
- **Reading 1:** 139.3 mV using a 0.05 m potassium hydrogen phthalate buffer standard (pH = 4.015)
- **Reading 2:** -160.7 mV using a 0.01 m borax buffer standard (pH = 9.139)
Both measurements were taken at a temperature of 30 °C.
---
**1. Determining the Observed Slope**
What is the observed slope (mV/pH unit) of the calibration curve?
\( \text{slope}_{\text{observed}} = \) [Input Box] mV/pH
---
**2. Theoretical Slope Calculation**
What is the theoretical slope at 30 °C?
\( \text{slope}_{\text{theoretical}} = \) [Input Box] mV/pH
---
**3. Calculating the pH of an Unknown Solution**
Determine the pH of an unknown sample that gives a reading of 42.5 mV with this electrode at 30 °C.
\( \text{pH} = \) [Input Box]
---
This exercise involves assessing the slope of the electrode calibration and determining unknown pH values based on the calibration data.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1548810f-0d74-4833-a3a0-92b9ff116e67%2Fcae83703-75cf-4cff-9aea-03570ed048a3%2F6bemzn_processed.png&w=3840&q=75)
Transcribed Image Text:**Calibration of a Glass Electrode**
The calibration process of a glass electrode provided the following readings:
- **Reading 1:** 139.3 mV using a 0.05 m potassium hydrogen phthalate buffer standard (pH = 4.015)
- **Reading 2:** -160.7 mV using a 0.01 m borax buffer standard (pH = 9.139)
Both measurements were taken at a temperature of 30 °C.
---
**1. Determining the Observed Slope**
What is the observed slope (mV/pH unit) of the calibration curve?
\( \text{slope}_{\text{observed}} = \) [Input Box] mV/pH
---
**2. Theoretical Slope Calculation**
What is the theoretical slope at 30 °C?
\( \text{slope}_{\text{theoretical}} = \) [Input Box] mV/pH
---
**3. Calculating the pH of an Unknown Solution**
Determine the pH of an unknown sample that gives a reading of 42.5 mV with this electrode at 30 °C.
\( \text{pH} = \) [Input Box]
---
This exercise involves assessing the slope of the electrode calibration and determining unknown pH values based on the calibration data.
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