4.6: Activity 3- Effect of Adding Acid and Base to Acetate Buffer
- Page ID
- 138920
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Per Group of 4:
- Everything From Activity (2 above)
- 30 mL dropper bottle of 0.1 M HCl (Hydrochloric Acid)
- 30 mL dropper bottle of 0.1 M NaOH (Sodium Hydroxide)
Procedure
- Add a single drop of HCl to each of your team’s 4 tubes. Close the lids and gently shake the tubes to thoroughly mix the contents.
- Measure the pH of each solution and enter the pH values in table 3.
- Continue adding drops of HCl according to the table, measuring pH, and recording values.
- When you have completed Table 3, you will now start adding drops of NaOH (base) to your tubes according to table 4.
- Be sure to shake the tubes to mix the contents thoroughly before measuring pH and entering the values in Table 4.
- Look at your results and compare the pH changes in your 4 tubes. What do you notice about the pH changes when you compare them?
- Compare your pH values to those of the other teams. Ask your instructor for the expected values.
|
Student |
Tube |
Volume of Acetic Acid (mL) |
Volume of Sodium Acetate (mL) |
Measured pH |
Expected pH (Ask Instructor) |
|---|---|---|---|---|---|
|
Buffer 1 |
5.0 |
5.0 |
|||
|
Buffer 2 |
7.0 |
3.0 |
|||
|
Buffer 3 |
3.0 |
7.0 |
|||
|
\(\ce{H2O}\) |
None |
None |
|
Tube |
pH after a total of _____ drops of acid (HCl) added |
||
|---|---|---|---|
|
1 drop |
2 drops |
3 drops |
|
|
Buffer 1 |
|||
|
Buffer 2 |
|||
|
Buffer 3 |
|||
|
\(\ce{H2O}\) |
|||
|
Tube |
pH after a total of _____ drops of base (NaOH) added |
||
|---|---|---|---|
|
1 drop |
2 drops |
3 drops |
|
|
Buffer 1 |
|||
|
Buffer 2 |
|||
|
Buffer 3 |
|||
|
\(\ce{H2O}\) |
|||