Question

2. Rank the following in order of increasing pKa. Explain your reasoning behind the order you...

2. Rank the following in order of increasing pKa. Explain your reasoning behind the order you choose.

propanoic acid             dichloracetic acid        acetic acid       chloroacetic acid         propanamide

3. Calculate the pH of a buffer solution made from 0.20 M HC2H3O2 and 0.50 M C2H3O2- that has an acid dissociation constant for HC2H3O2 of 1.8 x 10-5.

4. What is the ratio of [bicarbonate]/[carbonic acid] at the blood pH = 7.4? (The pKa of carbonic acid = 6.4)

5. How many moles of sodium acetate must be added to 0.120 moles of acetic acid and sufficient water to make a liter if we want a buffer with a pH of 4.50? The pKa of acetic acid is 4.74.

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