4.4: Activity 1- Measuring pH
- Page ID
- 138918
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Per group of 4:
- 1 Set of 4 unknown solutions (in 30 mL tubes with screw top lids)
- 1 container of pH indicator strips and color reference chart
- 1 pair of forceps
- 1 pH meter (calibrated – See instructor for directions)
Procedure
- Obtain a set of unknown solutions from instructor.
- Measure the pH of each solution using the pH indicator strips first. Hold the strips with the forceps. Use a new strip for each solution!
- Record your data in Table 1.
- Measure the pH of each solution using the pH meter. Be sure to rinse the tip of the probe with DI water before putting the probe into each sample! (Ask the instructor for instructions if you are not sure how to properly calibrate and use the pH meter).
- Record your data in Table 7.1.
|
Unknown Solution |
pH value measured using indicator strips: |
pH value measured using pH meter: |
Expected pH value: (Ask Instructor) |
|---|---|---|---|
|
A |
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|
B |
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|
C |
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|
D |
Data Analysis
- How do your pH indicator strip values compare to your pH meter values?
- Check your measured pH values with those of the other teams. Are your values similar?
- Check with your instructor to see what the actual pH values should be. How accurate were you?