1. Choose the correct answer and explain why.

a) A carboxylic acid with Ka = 1 x 10-4 is more likely (R-COOH vs. R-COO-) in the blood (pH = 7.45)

• R-COOH

• R-COO-

• Equally likely

b) A protonated amine with Ka = 1 x 10-10 is more likely (R-NH3+ vs. R-NH2) in the blood (pH = 7.45)

• R-NH3+

• R-NH2

• Equally likely

c) After CO2 reacts with water in the blood, which form is the most common? (H2CO3, HCO3-, or CO32-)

• H2CO3

• HCO3-

• CO32-

d) Which will reduce as seawater acidifies? ([H3O+], [H2CO3], or [CO32-])

• [HH3O+]

• [H2CO3]

• [CO32-]

• all of the above

e) Which will increase as seawater acidifies? (pH, [CO32-], [Ca2+], CaCO3(s))

• pH

• [CO32-]

• [Ca2+]

• CaCO3(s)