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6 June, 07:06

Determine the [ OH - ], pH, and pOH of a solution with a [ H + ] of 8.2 * 10 - 10 M at 25 °C. [ OH - ] = 1.22 * 10 - 5 M pH = 9.07 pOH = 4.91 Determine the [ H + ], pH, and pOH of a solution with an [ OH - ] of 0.0073 M at 25 °C. [ H + ] = 1.37 * 10 - 12 M pH = 11.86 pOH = 2.14 Determine the [ H + ], [ OH - ], and pOH of a solution with a pH of 7.20 at 25 °C. [ H + ] = M [ OH - ] = M pOH = 6.8 Determine the [ H + ], [ OH - ], and pH of a solution with a pOH of 6.43 at 25 °C.

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  1. 6 June, 10:58
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    See explanation below

    Explanation:

    At the beggining of the exercise, you already giving the solution for the 1st two problems, so I just going to answer the remaining question which are:

    "Determine the [ H + ], [ OH - ], and pOH of a solution with a pH of 7.20 at 25 °C. [ H + ] = M [ OH - ] = M pOH = 6.8 Determine the [ H + ], [ OH - ], and pH of a solution with a pOH of 6.43 at 25 °C."

    Now, to get every data in the problem, we need to write the expressions for every part, which are the following:

    pH = - log[H⁺] (1)

    pH = 14 - pOH (2)

    [H⁺] = 10^ (-pH) (3)

    [H⁺] = Kw / [OH⁻] (4)

    pOH = - log[OH⁻] (5)

    pOH = 14 - pH (6)

    [OH⁻] = 10^ (-pOH) (7)

    [OH⁻] = Kw / [H⁺] (8)

    Now, according to the given data, we will use any of these eight expressions.

    a) "Determine the [ H + ], [ OH - ], and pOH of a solution with a pH of 7.20"

    We have pH, so in this case, we will use expression (3), (6) and (8):

    [H⁺] = 10^ (-7.20)

    [H⁺] = 6.31x10⁻⁹ M

    pOH = 14 - 7.2

    pOH = 6.8

    [OH⁻] = 1x10⁻¹⁴ / 6.31x10⁻⁹

    [OH⁻] = 1.58x10⁻⁴ M

    b) "The [ H + ], [ OH - ], and pH of a solution with a pOH of 6.43 "

    In this case, we can use expressions (2), (4) and (7). Using those expressions we have:

    pH = 14 - 6.43

    pH = 7.57

    [H⁺] = 10^ (-7.57)

    [H⁺] = 2.69x10⁻⁸ M

    [OH⁻] = 1x10⁻¹⁴ / 2.69x10⁻⁸

    [OH⁻] = 3.72x10⁻⁷ M
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