The correct answer is 7.4 . The question gives you the information that blood is slightly basic. 10.6 is very basic (recall that pH is a logarithmic scale), 7 is neutral, 6.4 is slightly acid, and of course 4.6 is the most acid of the five choices.
QA › Biology › Human Blood pH
The pH of human blood is slightly basic. Which of the following is most likely to be the pH of human blood? Choices: 10.6, 7.4, 7.0, 6.4, 4,6