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    pH of a Mixed Buffer Solution

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    A buffer solution is made of 0.100 M HOCl and 0.250 M NaOCl. What is the pH of the resulting solution when a 15.0-mL portion of 0.200 M HCl is added to 100.0 mL of the buffer?

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    Solution Preview

    You need the buffers mathematical equation, and to be able to identify each speices.

    Ka = [H+] x (A-/HA)

    Ka is the Ka of the acid HA
    [H+] is your pH term (your answer in most cases)
    A- is the conjugate species of the acid HA
    HA is the acid that we have the Ka value for...

    Setting up the BUFFER equation...

    Ka = [H+] x 0.250/0.100

    From this we can find the pH before the ...

    Solution Summary

    The solution explains the steps necessary to find the pH of a buffer solution after some HCl is added in almost 300 words.