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1 November, 09:39

Calculate [OH-] for each solution.

1. pH = 13.48

Express your answer using two significant figures.

2. pH = 8.19

Express your answer using two significant figures.

3. pH = 2.12

Express your answer using two significant figures.

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Answers (1)
  1. 1 November, 10:00
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    1. [OH⁻] = 0.30 M; 2. [OH⁻] = 1.54x10⁻⁶M; 3. [OH⁻] = 1.32x10⁻¹³M

    Explanation:

    Remember the rule:

    pH + pOH = 14

    pOH = 14 - pH

    10*⁻pOH (you have to elevate 10, to - pOH)

    10*⁻pOH = [OH⁻]

    1. 14 - 13.48 = 0.52

    10⁻⁰°⁵² = 0.30

    2. 14 - 8.19 = 5.81

    10⁻⁵°⁸¹ = 1.54x10⁻⁶

    3. 14 - 2.12 = 12.88

    10⁻¹²°⁸⁸ = 1.32x10⁻¹³
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