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    esper's Avatar
    esper Posts: 3, Reputation: 1
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    #1

    Dec 13, 2010, 06:06 PM
    if a week acid has a dissociation constant of 6.4x10-6 what is the pH of a solution..
    if a week acid has a dissociation constant of 6.4x10-6 what is the pH of a solution of this acid in 0.10 molar concentration?
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #2

    Dec 15, 2010, 11:37 AM
    I think there are a lot of similar questions already answered on AskMe.
    Using the acid HA, set up the equation for K, let the concentration of H+ and A- be X, and let the concentration of acid stay at 10^-1M (the dissociation does not make a significant change in concentration). Solve for H+, use the definition for pH.
    I wonder if you looked for WEAK acids in your textbook you would find an explanation for this problem.
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