Weak acid- strong base titration: [NaOH]= 0.106 mol/L (titrant) Acetic acid volume= 10.0 mL per trial Observation Table:

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Weak acid- strong base titration:
[NaOH]= 0.106 mol/L (titrant)
Acetic acid volume= 10.0 mL per trial
Observation Table:
Lab based questions:
1) Calculate [CH3COOH] unknown based on the average of your two
trials.
2) Calculate the pH of the solution when 13.3 mL of NaOH has
been added. You cannot use the Henderson- Hasselbalch Equation.
3) Calculate pH at equivalence using your calculated [NaOH] and
your calculated [CH3COOH]
4) Why is the pH not equal to 7 at equivalence for the titration
of acetic acid with sodium hydroxide?
Please answer question 1-3 urgently, thank you!