What is the pH of a solution with [H+] = 7.0 x 10^-2

a. -1.15
b. 0.85
c. 1.15
d. -0.85

C. 1.15

Explanation:

The pH of a solution equals the negative log of [H+]. Put into you calculator     -log(7.0x10^-2) and you should get the right answer.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.