Question

usign the literature value of the acetic acid aand answer the following questions

pKa for acetic acid=4.74 , pH=4.35

Group#1: Buffer pH = 4.00

Group#2: Buffer pH = 4.35

Group#3: Buffer pH = 4.70

Group#4: Buffer pH = 5.00

Group#5: Buffer pH = 5.30

Group#6: Buffer pH = 5.60

1. Explain which group should havethe BEST OPTIMAL BUFFER (see choices above).

2. Explain which group has a buffer that has the HIGHEST BUFFERING CAPACITY AGAINST NaOH.

3. Explain which group has a buffer that has the HIGHEST BUFFERING CAPACITY AGAINST HCl.

4. Is the best optimal buffer the same as the buffer that has the HIGHEST buffer capacity againstNaOH? Explain your reasoning.

5. Is the best optimal buffer the same as the buffer that has the HIGHEST buffer capacity against HCl? Explain your reasoning.

Answer 1

1) the best optimal buffer is Group 2 at pH = 4.35 because this pH has same value as that of our acetic acid and is optimal buffer .

2) Group 1  has has the HIGHEST BUFFERING CAPACITY AGAINST NaOH because NaOH is a strong base we need to nulify the addition of base added and the only those ph buffer will help whose pH is very small and that is Group 1 .

3)  Group 6 has has the HIGHEST BUFFERING CAPACITY AGAINST HCL because HCL is a strong acid we need to nulify the addition of acid added and the only those ph buffer will help whose pH is very large and that is Group 6 .

4) the best optimal buffer GROUP 2 is not the same as the buffer that has the HIGHEST buffer capacity against NaOH group 1 because pH 0f acetic acid is = 4.35 which is provided only by group 2 but not by group 1 .

5) the best optimal buffer GROUP 2 is not the same as the buffer that has the HIGHEST buffer capacity against HCL group 1 because pH 0f acetic acid is = 4.35 which is provided only by group 2 but not by group 6 .