## Buffer solutions

Hi ppl, could anyone give me a hint as to how to calculate this:

Calculate the effect of adding 10cm3 of hydrochloric acid of concentration 1M to 1dm3 of a buffer. The buffer is a solution of ethanoic acid(Ka=1.8 * 10^-5 M) at a concentration of 0.1M and sodium ethanoate at 0.1M.

Thanks for any help
Joe
 use Henderson-Hasselbalch equation: $$pH=pK_a+log\frac{[A^-]}{[HA]}$$ if in doubt refer http://www.physicsforums.com/showthread.php?t=44645 and the rest. regards P.S:Many posts have come on this topic.Moderator,why dont we make such a topic Sticky for a month or two?
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