Look at Table 2 (in the procedure portion of the experiment). Calculate the pH y

Question

Look at Table 2 (in the procedure portion of the experiment). Calculate the pH you would expect each of the buffer solutions (A, B, C, D, and E) to be using the Henderson-Hasselbalch equation and assuming that the solutions of acetic acid and sodium acetate are equimolar.

Table 2: Buffer Solutions and pH Readings for Beakers A, B, C, D, and E.

Buffer

mL of Acetic Acid

mL of Sodium Acetate

pH measured

A

5

5

B

5

1

C

10

1

D

1

10

E

1

5

Buffer

mL of Acetic Acid

mL of Sodium Acetate

pH measured

A

5

5

  

B

5

1

C

10

1

D

1

10

E

1

5

Explanation / Answer

WE know

pH = pKa + log [Salt]/ [Acid]

1. pH = 4.75 + log [5]/[5] = 4.75

2. pH = 4.75 + log 1/5 = 4.05

3. pH = 4.75 + log 1/10 = 3.75

4.pH = 4.75 + log 10 = 5.75

5. pH = 4.75 + log 5 = 5.44

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