1. the pH of blood is affected by

- the reaction of CO2 with H20 to form carbonic acid
- the ionization of aqueous carbonic acid to hydronium ions and the bicaronate ions
- the decrease of the blood pH due to the production of hydronium ions
- the excretion of bicarbonate and ammonium ions from the kidneys

2. The capacity of a buffer to resist changes in pH upon addition of protons or hydroxide ions depends on

- the pka of the weak acid in the buffer
- the pH of the buffer
- the total concentration of the weak acid and its conjugate base in the buffer

3. the pH at the midpoint in the titratation of an acid with a base is

equal to the pK of the corresponding acid

4. A graduate student at SDSU wants to measure the activity of a particular enzyme at pH 4.0. To buffer her reaction, she will use a buffer system based on one of the acids listed below, which acid is most appropriate for the experiment?

formic acid

5. The pH of a 0.1 M solution of sodium acetate would be

basic, because of the acetate ion reacts with water to form acetic acid and OH-

6. The pH of coffee is 5.6. The pH of grapefruit juice is 2.6. This means that the proton concentration in coffee is

a thousand times lower than in grapefruit juice

7. weak acids

are only partially ionized in an aqueous solution

8. Kw, the ionization constant of water, is _____ at _____.

10-14; 25°C

9. osmotic pressure is a function of

solute concentration

10. Physical properties that depend on the amounts of various species, rather than the identities of those species, are called

colligative properties