The pH of a 0.0642 M solution of a monoprotic acid
is 3.86. Is this a strong acid?

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  1. figure the pH of a strong acid..

    HX>>H + X

    so pH= log (.0642)=1.2 which is considerably lower than 3.86. Probably not a strong acid. Lets look further.

    work backwards.

    concentration H= antilog 3.86

    WEll, the acid is .00014/.0642 * 100 percent ionized, or .21 percent ionized.

    check my work.

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