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09-12-2021
Chemistry

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An ammonia solution has a pH of 8.25. What is its [OH-]?

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Naomi9640 Naomi9640

09-12-2021

pH + pOH = 14

If pH=8.25, then:

pOH = 14 - 8.25 = 5.75

pOH = -log[OH-]

5.75 = -log[OH-]

-5.75 = log[OH-]

10^(-5.75) = [OH-]

[OH-] = 0,0000017783

[OH-] = 1,78×10^(-6) mol/dm³

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