Acid–base titration

Aim

Follow a strong acid–base titration and use its endpoint to estimate equivalence.

1. Tell an observed endpoint apart from the equivalence point.
2. Apply the 1:1 mole ratio to find an unknown concentration.
3. Explain why closely agreeing repeat titres strengthen a result.

Apparatus

1. Burette on a stand and a conical flask
2. Volumetric pipette with a filler for measuring the acid
3. Dilute HCl, standard NaOH, phenolphthalein, and a white tile for seeing the colour