Question

Use the Henderson-Hasselbalch equation to calculate the pH of each of the following solutions.

A. a solution that contains 0.800% C5H5N by mass and 0.950% C5H5NHCl by mass (where pKa=5.23 for C5H5NHCl

B. a solution that has 17.0 g g of HF and 27.0 g g of NaF in 125 mL m L of solution (where pKa=3.17 for HF acid)

Answer 1

Page No. Date According to Henderson Hasselbalch equation, pn-pka + log [salt? - OR pon = pk + log Csalt] Base] A pka = 5.23 pk + pka = 14 = pk = 14-5.23 = 8.77 Chan 100 - 0.800 wt. of Wt of solution LOO Let weight of solution be 1 kg = 1000g T 0.800 = Wt. of Cg han 100 wit of ConsN- 80g Similarly for Co Ng Nhce 0.950 = wt of g h . Nn ce x 100 Wt. of Cong NHU - a.sg I solution a water al - Volume of solution. Wt of solutions of 1kg / 1 kg IL 1000 ILO