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Yakvenalex [24]
4 years ago
9

Calculate the hydroxide ion concentration in an aqueous solution with a pH of 9.85 at 25°C. 8.7 × 10-10 M 1.4 × 10-10 M 4.2 × 10

-10 M 6.5 × 10-5 M 7.1 × 10-5 M
Chemistry
1 answer:
Virty [35]4 years ago
7 0

Answer:

7,1x10⁻⁵M = [OH⁻]

Explanation:

pH is the -log of hydronium ion. pOH is -log of hydroxide ion. Knowing pH + pOH = 14:

14 = 9,85 + pOH

pOH = 14 - 9,85

pOH = 4,15

-log [OH⁻] = 4,15

10^-4,15 = [OH⁻]

<em>7,1x10⁻⁵M = [OH⁻]</em>

<em></em>

I hope it helps!

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