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26 March, 03:34

1. What is the pH of a solution if the [OH-] = 4.0x10-11M?

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Answers (1)
  1. 26 March, 05:12
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    pH = 4

    Explanation:

    Given data

    [OH⁻] = 4.0 * 10⁻¹¹ M

    Step 1: Calculate the pOH

    We will use the following expression.

    pOH = - log [OH⁻]

    pOH = - log 4.0 * 10⁻¹¹

    pOH = 10

    Step 2: Calculate the pH

    We will use the following expression.

    pH + pOH = 14

    pH = 14 - pOH

    pH = 14 - 10

    pH = 4

    The pH scale is used to define the acidity or alkalinity of a solution. in this case, since pH < 4, the solution is acid.
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