Description
All Waste can mix together and then go down the drain. Hot plates are located in the ends of each lab bench.
You may use a transparent test tube holder for your buffer solutions if one is available. This allows you to more easily compare the colors of the unknown solutions to your knowns.
Household chemicals are located at the back table with the cabbage. You can find a few different samples. You do not need to bring your own.
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Question 1:
Data and Observations Part A: Cabbage Indicator
pH | Color |
2 | |
4 | |
6 | |
7 | |
8 | |
10 | |
12 |
Part B: Cabbage Indicator
Substance | Color | pH | Acidic, Basic, or Neutral |
dish soap | |||
shampoo | |||
glass cleaner |
Question 2:Data and Observations Part C: Buffers
For this section, you may upload an image of your data tables if you prefer. Files will be graded by hand, separately.
Total Number of Drops of HCl(aq) Added | DI Water | Buffered Solutions | ||
Color | pH | Color | pH | |
0 | ||||
1 | ||||
2 | ||||
3 | ||||
4 | ||||
5 |
Total Number of Drops of NaOH(aq) Added | DI Water | Buffered Solutions | ||
Color | pH | Color | pH | |
0 | ||||
1 | ||||
2 | ||||
3 | ||||
4 | ||||
5 |
Question 3:To determine the pH of an unknown solution, a student uses adds 10 drops of red cabbage indicator to the solution, but the solution remains colorless.
Can the student determine if the solution is acidic, basic, or neutral? Explain.
Question 4:Consider other tests you have carried out on acids and bases during the quarter.
Suggest another method for determining if the unknown solution is acidic, basic, or neutral.
Question 5:What happened to the pH of DI water when the hydrochloric acid was added to it?
A.)What happened to the pH of DI water when the sodium hydroxide was added to it?
B.)What happened to the pH of the buffered solution when hydrochloric acid was added to it?
C.)What happened to the pH of the buffered solution when sodium hydroxide was added to it?
D.)Briefly describe any differences or similarities for any pH changes observed for DI water compared to a buffered solution when hydrochloric acid was added to each.
E.)Briefly describe any differences or similarities for any pH changes observed for DI water compared to a buffered solution when sodium hydroxide was added to each.
Question 6:Consider a buffer solution that consists of two separate components: the weak acid, HF(aq), and its conjugate base, F-(aq) (added as NaF).
Which component will react with H+(aq) from a strong acid? Write the net ionic equation for the reaction that occurs when H+(aq) is added to the buffered solution.
Which component will react with OH- (aq) from a strong base? Write the net ionic equation for the reaction that occurs when OH-(aq) is added to the buffered solution.

Explanation & Answer

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Question 1
Data and Observations
Part A: Cabbage Indicator
pH=2
Light Pink
pH=4
Dark Pink
pH=6
Purple
pH=7
Dark Blue
pH=8
Blue
pH=10
Blue-Green
pH=12
Green-Yellow
Part B: Cabbage Indicator
Color
pH
Acidic, Basic, Neutral
dish soap
Dark Purple
6,5
Acidic
shampoo
Dark Pink
5
Acidic
glass
cleaner
Green
10
Basic
Question 2:
Data and Observations
Part C: Buffers
Dl Water
Buffer
Drops of HCl
added
Color
pH
Color
pH
0
Blue
7
Blue
7
1
Light Purple
6
Blue
7
2
NOT SHOWED
NOT SHOWED
NOT SHOWED
NOT SHOWED
3
Pink
4
Blue
7
4
Light Pink
3
Blue
7
5...
