Chemistry
Solutions
Chemistry
You have the following reagents on hand:
| Solids (pKa of Acid Form Is Given) | Solutions |
| Benzoic acid (4.19) | 5.0 M HCI |
| Sodium acetate (4.74) | 1.0 M acetic acid (4.74) |
| Potassium fluoride (3.14) | 2.6 M NaOH |
| Ammonium chloride (9.26) | 1.0 M HOCI (7.46) |
What combinations of reagents would you use to prepare buffers at the following pH values?
a. 3.0
b. 4.0
c. 5.0
d. 7.0
e. 9.0
(a)
Interpretation:
The correct combination from the given reagents that can be used to prepare buffers at the given
Concept introduction:
A solution that resists a change in the
Explanation
The given
A buffer shows the presence of equal quantities of the weak acid and its conjugate base. Hence, the ratio,
The relation between
Hence, to make a b
(b)
Interpretation:
The correct combination from the given reagents that can be used to prepare buffers at the given
Concept introduction:
A solution that resists a change in the
(c)
Interpretation:
The correct combination from the given reagents that can be used to prepare buffers at the given
Concept introduction:
A solution that resists a change in the
(d)
Interpretation:
The correct combination from the given reagents that can be used to prepare buffers at the given
Concept introduction:
A solution that resists a change in the
(e)
Interpretation:
The correct combination from the given reagents that can be used to prepare buffers at the given
Concept introduction:
A solution that resists a change in the
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