Human blood, which has a pH of approximately 7.4, is a/an _______ substance.

A. neutral C. basic
B. acidic D. alkaline

The body maintains a pH of 7.5, and human blood has a
normal range between 7.35 to 7.45—almost neutral.

Numbers below 7 are increasingly acidic, and numbers
above 7 are increasingly alkaline (sometimes called
basic).

I'm confused, plz help.
I think the answer (A) but I think it is (D) also.

Blood is a weakly alkaline substance. Answer D is best. Answer C is correct, but best form terminology is alkaline. If I were the grader, I would count both correct. It is a lousy question.

thanks!

I understand your confusion. Let's break down the information to better understand. The pH scale is a way to measure the acidity or alkalinity of a substance. It ranges from 0 to 14, where 7 is considered neutral. Acidity increases as the values go lower than 7, and alkalinity increases as the values go higher than 7.

Now, let's consider human blood which has a pH of approximately 7.4. This value is slightly on the alkaline side but still within the normal range for human blood, which is between 7.35 and 7.45. Since the pH of human blood is slightly higher than 7, it is considered alkaline or basic. Therefore, based on the information provided, the correct answer is option D - alkaline.

Remember, understanding the pH scale and its range can help you determine whether a substance is acidic, neutral, or alkaline.