Acid -- base titration is performed with a bromothymol blue indicator, when it is a strong acid -- strong base titration, a phenolphthalein indicator in weak acid -- strong base reactions, and a methyl orange indicator for strong acid -- weak base reactions. If the base is off the scale, i.e. a pH of > 13.5, and the acid has a pH > 5.5, then an Alizarine yellow indicator may be used. On the other hand, if the acid is off the scale, i.e. a pH of < 0.5, and the base has a pH < 8.5, then a Thymol Blue indicator may be used.
indicator for titration of strong acid with strong base
bromothymol blue