What is the concentration of OH in a solution with a H+ concentration

1.	What is the concentration of OH in a solution with a H+ concentration of 1.3 10-4 M?
A.	7.7 10<sup>-10</sup> M
B.	7.7 10<sup>-9</sup> M
C.	7.7 10<sup>-11</sup> M
D.	7.7 10<sup>-12</sup> M
Answer» D. 7.7 10<sup>-12</sup> M

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