Buffer capacity is a measure of a buffer solution\\\'s resistance to changes in

Question

Buffer capacity is a measure of a buffer solution's resistance to changes in pH as strong acid or base is added. Suppose that you have 195 mL of a buffer that is 0.380 M in both formic acid (HCOOH) and its conjugate base (HCOO–). Calculate the maximum volume of 0.470 M HCl that can be added to the buffer before its buffering capacity is lost.

I've seen a few other questions like this on here that have been notably wrong. I would appreciate multiple attempts/answers just in case please! Thank you!

Explanation / Answer

conjugate base millimoles = 195 x 0.380 = 74.1

for maximum buffer capacity the conjugate base millimoles should be equal to strong acid/base millimoles

74.1 = HCl millimoles

74.1 = 0.470 x V

V = 157.7 mL

maximum volume of HCl added = 157.7 mL

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