One of the most important properties of water solutions, in biochemistry, is pH.

Question

One of the most important properties of water solutions, in biochemistry, is pH. Recall the definition of pH. pH = - log [H+] In most cases (for instance, inside cells or in blood) the pH is between 7 and 8. But in the gut of larvae of butterflies and moths, the pH can be 10 (or even higher). (By the way, Monarch butterfly migration is going on in Kansas right now -- migration to the south for overwintering in a particular region of Mexico.)

Which of the following would the [H+] be if the pH is 10?

A. 1 M

B. 0.004 M

C. 0.00000000010 M

D. 10 M

Explanation / Answer

C . 0.00000000010 M as

pH = -log(0.00000000010) = 10

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