Babygirll1586 Babygirll1586 Today at 7:13 AM Mathematics Answered A 25.0 mL sample of 0.125 molL−1 pyridine (Kb=1.7×10−9) is titrated with 0.100 molL−1HCl. Calculate the pH at one-half equivalence point. Calculate the pH at 40 mL of added acid. Calculate the pH at 50 mL of added acid.