Question

Design a buffer that has a pH of 6.66 using one of the weak acid/conjugate base...

Design a buffer that has a pH of 6.66 using one of the weak acid/conjugate base systems shown below.

Weak Acid Conjugate Base Ka pKa

HC2O4-

C2O42-

6.4×10-5

4.19

H2PO4-

HPO42-

6.2×10-8

7.21

HCO3-

CO32-

4.8×10-11

10.32



How many grams of the potassium salt of the weak acid must be combined with how many grams of the potassium salt of its conjugate base, to produce 1.00 L of a buffer that is 1.00 M in the weak base?

grams potassium salt of weak acid =  g

grams potassium salt of conjugate base =  g

Homework Answers

Answer #1

Using the Henderson-Hasselbalch equation:

Now, a rule of thumb in selecting a desirable system is to select a system with pKa closest to the desired pH.

Thus we select the system.

To make 1L 1M [A-] salt needed = 1 mole of K2HPO4 = 174.2 g

To make 1L 3.55 M [HA] salt needed = 3.55 mole of KH2PO4 = 3.55 x 136.086 = 483.1 g

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