The graph shows how pH changes during titration of 50 cm3 of 0.1 M CH3COOH with 0.1 M NaOH.
CH3COOH (aq) + NaOH (aq) → CH3COONa (aq) + H2O (l)
The vertical portion of this titration curve between pH range 7 to 10.6. Phenolphthalein is suitable indicator for this titration. Methyl orange is not suitable for this titration because its pH range on the flat portion of the curve.
