An ammonia solution has a pH of 8.30, what is the [OH-] in this solution?

5.0 X 10^- 23 M
2.0 X 10^-6 M
5.0 X 10^-9 M
2.0 X 10^8 M

Answer:
pH = 8.30
pOH = 14 - 8.30 = 5.7
[OH-] = 10^-5.7 = 2.0 x 10^-6 M

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