Answer :
Answer: C. pH decreases
Explanation: Assuming that carbonic acid is released into the blood and not from the blood, pH levels would decrease.
The pH scale is a system that measures how acidic or basic a substance is. The scale ranges from 0 to 14. The more acidic a substance is, the lower its pH. The more basic/alkaline a substance is, the higher its pH. A substance with a pH of 7 is known as a neutral substance. Water is an example of a neutral substance. Any pH lower than 7 is considered acidic, while any pH higher than 7 is considered basic.
Since carbonic acid is an acid, it would have a pH lower than 7. In the problem, the person's blood has a pH of 7.5 meaning that it is slightly basic. Thus, adding an acid to the solution would lower the pH of the solution and turn it basic. As a result, the correct answer is choice C.
