We poured out some more solution of Buffer A and slowly added 0.1 HCl until pH decreased by about 2 (So pH 4 to pH 2). Buffer B followed the same procedure, with just diff molarities and such. --. Q: Buffer capacity has a rather loose definition yet it's an important property of buffers. A commonly seen definition of buffer capcity is: The amount of H+ or OH-that can be neutralized before the pH changes to a significant degree.. Use your data to determine the buffer capacity of Buffer A and B.