A 1.00 L solution of a HCOOH/HCOONa buffer has pH 3.60, and [HCOONa] = 0.68 M. After 50.0 mL of 1.00 M HCl are added, what is the new pH?
a. 3.30
b. 3.45
c. 3.75
d. 4.00

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