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Answer:

[OH⁻] = 0.016

Explanation:

Given data:

pH = 12.2

Hydroxide ion concentration = ?

Solution:

It is known that,

pH + pOH = 14

12.2 + pOH = 14

pOH = 14 - 12.2

pOH = 1.8

pOH = -log [OH⁻]

1.8 = -log [OH⁻]

10⁻¹°⁸ = [OH⁻]

[OH⁻] = 0.016

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