#5

Titration of 10.0 mL HOAc-solution (with unknown concentration) with 0.108 mol/L NaOH(aq). The equivalence point is reached after adding 10.4 mL NaOH. 1. Calculate the original HOAc-concentration. 2. Calculate the pH at the start of the titration (0 mL added). 3. Calculate the pH after adding 5.0 mL NaOH. 4. Calculate the pH after adding 10.4 mL NaOH (EP). 5. Calculate the pH after adding 15.0 mL NaOH.

a	Write the chemical reaction that occurs upon adding NaOH to HOAc.
1a	How many moles of NaOH are present in 10.4 mL of 0.108 mol/L NaOH?
1b	How many moles of HOAc were present at the start?
1c	Calculate the original HOAc-concentration.
2a	What is HOAc?
2b	Calculate the H+-concentration at the start.
2c	Calculate pH at the start.
3a	How many moles of NaOH are present in 5.0 mL of 0.108 mol/L NaOH?
3b	How many moles of HOAc are left after the reaction?
3c	How many moles of OAc- are present after the reaction?
3d	Calculate pH at this moment.
4a	How many moles of NaOH are present in 10.4 mL of 0.108 mol/L NaOH?
4b	How many moles of HOAc are left after the reaction?
4c	How many moles of OAc- are present after the reaction?
4d	What is OAc-?
4e	Calculate pH at this moment.
5a	How many moles of NaOH are present in 15.0 mL of 0.108 mol/L NaOH?
5b	How many moles of NaOH are left after the reaction?
5c	Calculate pOH.
5d	Calculate pH.