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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.