Use information from Appendix D to calculate the pH of (a) a solution that is 0.150 M in sodium formate (HCOONa) and 0.200 M in formic acid (HCOOH); (b) a solution that is 0.210 M in pyridine (C5H5N) and 0.350 M in pyridinium chloride (C5H5NHCl); (c) a solution that is made by combining 125 mL of 0.050 M hydrofluoric acid with 50.0 mL of 0.10 M sodium fluoride.
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