Subject: Which solution will the buffer work in?

I have just performed a lab and I was wondering if you can help me.  i first 
made a 15mL buffer solution containing 15mL of 0.1mol/L acetic acid and 0.1 g 
of sodium acetate.  I had five test tubes.  In tube A there was 5mL of 
distilled water and 5mL of 0.1 mol/L HCl.  In tube B there was 5 mL of the 
buffer and 5mL of the HCl.  Nothing but the buffer was in tube C (the 
control).  In tube D there was the 5mL of buffer and 5mL of 0.1mol/L NaOH.  In 
tube E there was 5mL of distilled water and 5mL of NaOH.  For the final pH of 
the tubes i got A=1, B=2, C=4, d=13, E=14.  Did the buffer work in tube B 
because the change in pH was smaller than the change in tube D? 

Re: Which solution will the buffer work in?