Data And Report Submission - Buffer Solutions

(2pts) Investigation of Buffer Solutions

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Investigation of Buffer Solutions Data Entry

Molarity of acetic acid solution

0.50

Molarity of sodium acetate solution

0.50

Table 1 - Investigation of Strong Acid Buffer Capacity Data Entry

Table 1 - Investigation of Strong Acid Buffer Capacity Data Entry

	Initial pH	pH after 1 mL 3.0 M HCl	pH after 2 mL 3.0 M HCl	pH after 3 mL 3.0 M HCl
Beaker 1	2.52	1.61	1.36	1.20
Beaker 2	4.01	2.82	1.49	1.30
Beaker 3	4.70	4.30	3.83	2.67
Beaker 4	5.30	4.85	4.46	3.97
Beaker 5	7.14	5.33	4.88	4.51

Table 2 - Investigation of Strong Base Buffer Capacity Data Entry

Table 2 - Investigation of Strong Base Buffer Capacity Data Entry

	Initial pH	pH after 1 mL 3.0 M NaOH	pH after 2 mL 3.0 M NaOH	pH after 3 mL 3.0 M NaOH
Beaker 1	2.78	3.81	4.21	4.63
Beaker 2	4.22	4.60	4.85	5.36
Beaker 3	4.68	5.00	5.50	12.18
Beaker 4	5.16	5.82	12.12	12.66
Beaker 5	7.20	12.55	12.73	12.86

(10pts) Analysis of Buffer Capacity

1. Identify the maximum amount of HCl that can be added to each buffer solution #2-4 without the pH changing by more than 1 pH unit from the initial pH. If the pH changed by more than one pH unit upon the first addition of HCl choose "Unable to buffer." If the pH never changed by more than one pH unit, choose "Buffer capacity was not reached."

(1pts)

Beaker 2

Choose...Unable to buffer1 mL HCl2 mL HClBuffer capacity was not reached

Saved

(1pts)

Beaker 3

Choose...Unable to buffer1 mL HCl2 mL HClBuffer capacity was not reached

Saved

(1pts)

Beaker 4

Choose...Unable to buffer1 mL HCl2 mL HClBuffer capacity was not reached

Saved

2. Identify the maximum amount of NaOH that can be added to each buffer solution #2-4 without the pH changing by more than 1 pH unit from the initial pH. If the pH changed by more than one pH unit upon the first addition of NaOH choose "Unable to buffer." If the pH never changed by more than one pH unit, choose "Buffer capacity was not reached."

(1pts)

Beaker 2

Choose...Unable to buffer1 mL NaOH2 mL NaOHBuffer capacity was not reached

Saved

(1pts)

Beaker 3

Choose...Unable to buffer1 mL NaOH2 mL NaOHBuffer capacity was not reached

Saved

(1pts)

Beaker 4

Choose...Unable to buffer1 mL NaOH2 mL NaOHBuffer capacity was not reached

Saved

(2pts)

3. Relate the ratio of [CH₃CO₂^-] to [CH₃CO₂H] in buffer Solutions #2-4 to its ability of a buffer to neutralize strong acid and strong base.

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Buffers are considered to be effective when the ratio is between 10:1 and 1:10,

(2pts)

4. Describe how the pH changes when 3.0 M HCl and 3.0 M NaOH was added to acetic acid (Solution #1) and sodium acetate solutions (Solution #5).

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(38pts) Calculations