25.0 mL of a 0.20 M solution of the weak acid CH₃COOH (Ka = 1.8 í— 10-5) is titrated with 0.25 M NaOH. Place the steps required to calculate the pH at the equivalence point in the correct order, starting with the first step at the top of the list.
1) Determine the moles of CH₃COOH in the solution
2) Calculate the volume of NaOH required to reach the equivalence point
3) Determine the concentration of CH₃COOH in the solution
4) Calculate the pH using the Henderson-Hasselbalch equation
5) Calculate the moles of NaOH used in the titration