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9 January, 06:42

Given pH = 8.55 Find: [H3O+] and [OH-] Is this acidic, basic or neutral?

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  1. 9 January, 06:44
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    The given pH = 8.55

    Unknown:

    [H₃O⁺] = ?

    [OH⁻] = ?

    In order to find these unknowns we must first establish some relationship.

    pH = - log[H₃O⁺]

    8.55 = - log[H₃O⁺]

    [H₃O⁺] = inverse log₁₀ (-8.55) = 2.82 x 10⁻⁹moldm⁻³

    To find the [OH⁻],

    pH + pOH = 14

    pOH = 14 - pH = 14 - 8.55

    pOH = 5.45

    pOH = - log[OH⁻]

    [OH⁻] = inverse log₁₀ (-5.45) = 3.55 x 10⁻⁶moldm⁻³

    The solution is basic because it has more concentration of OH⁻ ions compared to H⁺ ions.
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