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20 December, 18:51

What is the H3O + ion concentration of a solution that has an OH - ion concentration of 1.0 * 10^-3M?

A) 1.0 * 10^-3M

B) 1.0 * 10^-7M

C) 1.0 * 10^-11M

D) 1.0 * 10^-14M

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  1. 20 December, 20:45
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    Answer: C. 1.0 * 10^-11M

    Explanation:

    First Step: Determine the pOH of the solution by taking the - Log [-OH]

    pOH = - Log (1.0 * 10^-3)

    = 3

    Second Step : Obtain the pH, using the following equation; pH + pOH = 14

    pH + 3 = 14, making pH the subject of the formular we then have;

    pH = 14 - 3 = 11.

    Last Step: Take the anti-log of the pH to get the concentration of H3O+.

    ∴ Anti-log of 11 = 1.0 * 10^-11M
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