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11-07-2017
Chemistry

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A solution of ammonia has a pH of 11.8. What is the concentration of OH– ions in the solution?

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dec77cat dec77cat

11-07-2017

NH₃ + H₂O ⇄ NH₄⁺ + OH⁻

pOH=-lg[OH⁻]
pOH = 14-pH

14-pH = -lg[OH⁻]

[OH⁻]=10^(pH-14)

[OH⁻]=10^(11.8-14)=0.00631 = 6.31·10⁻³ mol/L

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