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8 January, 02:28

Which of the following conditions indicate a basic solution at 25°C?

a. POH=11.21

b. pH=9.42

c. [OH-]>[H+]

d. [OH]> 1.0 x 10^-7 M

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  1. 8 January, 02:48
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    B., C. and D.

    Explanation:

    pH is defined as the negative logarithm of the concentration of hydrogen ions.

    Thus,

    pH = - log [H⁺]

    pH scale generally runs from 1 to 14 where pH = 7 represents neutral medium, pH 7 represents basic medium.

    Also, pH + pOH = 14

    (a) So, pOH = 11.21

    pH = 14 - 11.21 = 2.79

    The solution is acidic.

    (b) pH = 9.42

    The solution is basic.

    c. [OH⁻] > [H⁺]

    More concentration of hydroxide ions leads to basic solution.

    d. [OH⁻]> 1.0 x 10⁻⁷ M

    1.0 x 10⁻⁷ M leads to neutral solution and hydroxide ions concentration greater than this yields to basic solution.
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