1. What is the pH of a solution made by combining 0.100 M C6H5COOH and 0.300 M sodium benzoate in water to make a 2.00 liter solution? (Ka = 6.3 X 10^-5) 2. Calculate the pH after adding 0.0200 liter of 1.00M nitric acid.
3. Calculate the pH after adding 0.0200 liter of 1.00M potassium hydroxide.

Which of the following characteristics are true of enzymes? check all that apply. a.)the structure of an enzyme can change if conditions change. b.)a single enzyme can normally catalyze a wide variety of reactions under many conditions. c.)enzymes are found only in nonliving systems. d.)enzymes allow living things to regulate body conditions through feedback mechanisms. e.)enzymes bind to specific substrates in specific ways. f.)enzymes increase the rate of reaction. g.)when shown in energy-reaction diagrams, enzymes represent the higher activation energy.