26. What is the pH of a 0.1M solution of ascorbic acid? Forascorbic acid, pKa1 = 4.10, pKa2 = 11.79.

a. 1.05 b. 2.55 c. 2.76 d. 3.58 e. 4.40 27.

b is the answer

27) In a solution buffered by 40 mM Tris, pH 8.6, what is theconcentration of the conjugate base Triso ? (For Tris, pKa =8.1).

a. 5 mM b. 10 mM c. 20 mM d. 30 mM e. 40 mM

d is answer

28. If ?S = -0.110 kJ/K mol and ?H = -16.0 kJ/mol for a reactionat 37°C, what is the change in free energy for the reaction?

a. +18.1 kJ/mol b. +22.8 kJ/mol c. -67.7 kJ/mol d. -53.2 kJ/mole. -55.1k J/mol

a is the answer