Collin County Community College Acids Bases and PH Report Sheet Biology Lab
Question Description
Download the report sheet, complete it, and then submit it via Blackboard email as an attachment.Do not change the format.
All blue shaded areas require answers.
I.Using indicators to measure pH
Experiment (at home lab)
Making a set of standards (5 ml solution + 5 ml cabbage extract)
|
pH |
substance |
color |
|
2 |
lemon juice |
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3 |
vinegar |
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5(optional) |
rainwater |
|
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7 |
tap water |
|
|
11.5 |
ammonia or soapy water |
Determining the pH of some solutions (5 ml unknown + 3 ml cabbage extract)
|
Unknowns |
estimate pH value (not color) |
|
7up® |
|
|
grapefruit juice |
|
|
bleach |
II.The pH Meter and pH paper
Experiment (dry lab)
Measuring pH using a pH meter and pH paper.
|
Solution |
pH meter |
pH paper (estimate pH value not color) |
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distilled water |
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apple juice |
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vinegar |
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carbonated soft drink |
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coffee |
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detergent water |
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milk |
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Which solution is most acidic? |
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Which solution is most basic? |
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Which measurement is more accurate, pH meter or pH paper? |
III.Buffers
Experiment (dry lab)
Determine the buffering capacity of a solution.
pH of Solution A
|
0 ml |
1ml |
2ml |
3ml |
4ml |
5ml |
6ml |
7ml |
8ml |
9ml |
10ml |
|
|
HCl |
|||||||||||
|
NaOH |
pH of Solution B
|
0 ml |
1ml |
2ml |
3ml |
4ml |
5ml |
6ml |
7ml |
8ml |
9ml |
10ml |
|
|
HCl |
|||||||||||
|
NaOH |
Plot both A and B solutions, A in red and B in blue. (This can be done using Microsoft insert shapes or manually graph, scan and embed image into your report).
Which is the better-buffered solution, A or B?
The better-buffed solution will resist a change in pH.
IV.How Effective are Stomach Antacids?
Experiment (dry lab)
Neutralization capacity of antacids
|
Flasks |
Initial pH |
Final pH |
|
control |
||
|
Rolaids |
||
|
Alka-Seltzer |
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Tums |
Which antacid neutralized the most acid?
Questions
1. |
Would you have been able to determine the pH of the three unknowns using the cabbage juice if you had not made your standards (the test tubes containing each of the buffers and the cabbage juice)?Yes or no. |
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2. |
Suppose that you were given a sample that had a pH of 6.5 but you were unaware of the pH.a. Can you perceive a problem that would arise if you attempted to determine the pH of this sample using either anthocyanins or pH paper? |
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|
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b. What about using a pH meter? |
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3. |
a. Is the use of anthocyanins qualitative or quantitative? |
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b. is the use of a pH meter qualitative or quantitative? |
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4. |
Which measurement would you consider to be a most reliable measurement; anthocyanins, pH paper or pH meter? |
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End of Lab J
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