16. A student is using a straw to blow bubbles into a calcium hydroxide solution. The carbon dioxide in the student's breath is reacting with the water to form an acid, which
begins to neutralize the basic solution. Which of the following best describes the initial
change in pH of the solution?
A. increase in pH toward a pH of 7
B. increase in pH away from a pH of 7
C. decrease in pH toward a pH of 7
D. decrease in pH away from a pH of 7