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    tampayhew's Avatar
    tampayhew Posts: 1, Reputation: 1
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    #1

    Apr 21, 2009, 08:29 AM
    General Chemistry pH
    What is the pH of a solution that results from diluting 0.50mol formic acid (HCO2H) and 0.10 mol sodium formate (NaHCO2) with water to a volume of 1.0 L? (Ka of HCO2H = 1.8 x 10^-4)
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
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    #2

    Apr 21, 2009, 08:44 AM

    This comes from the definition of Ka:



    where the numbers in brackets, [] are concentrations (moles/liter)

    (equation 1)





    Enter those into equation 1, above, and solve for . The pH is defined as:

    (equation 2)

    so, once you have found the hydrogen ion concentration (equation 1), calculate the pH from equation 2.
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