Calculating buffer capacity? Chemistry problem help!?

Posted on 2017-03-16 18:28:00 in Chemistry by ALEXIA

I don't understand this problem, can someone please help me get the answer? work (if possible) is appreciated please. 

Buffer capacity is defined as the number of moles of a strong acid or strong base that is required to change the pH of 1 L of the buffer solution by one unit. What is the buffer capacity of a solution that is 0.12 M in acetic acid and 0.12 M in sodium acetate? (Ka for acetic acid is 1.8x10^-5.) 

Buffer Capacity=____mol/L

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