In an aqueous solution the [H+] is 1.0 ´ 10-5 M. What is the [OH-]?

1.0 ´10-9 M
1.0 ´ 10-7 M
1.0 ´ 10-5 M
1.0 ´ 109 M

Answer:
[H+] × [OH-] = 10^(-14)

[OH-] = 10^(-14) / 10^(-5) = 10^(-9)

[OH-] = 1 × 10^(-9)

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