Two students performed a titration to determine the concentration of a solution of acetic acid (HC2H3O2).
They used a known solution of 0.100M potassium hydroxide (KOH) as the standard solution.

1. Write a balanced formula equation for this acid-base reaction.

2. Consider the strengths of the acid and base used in the titration. Would you expect the results of the
reaction to be neutral, slightly acidic, or slightly basic? Explain.

3. Phenolphthalein was chosen as an indicator for the reaction. Why was phenolphthalein a good
choice?

4. How could using a piece of plain, white paper under the flask as the students did the titration help
them determine the end point?