Which Indicator Is Used in the Titration of NaOH and H2SO4?

The indicator phenolphthalein is used in the titration of NaOH and H2SO4. Phenolphthalein turns bright pink when the titration is complete and the sulfuric acid is neutralized.

Acid-base titration is a process that scientists utilize to neutralize an acid in order to determine the acid's concentration. In the titration of NaOH and H2SO4, an unknown concentration of H2SO4 is added to a flask. Next, NaOH is added to the H2SO4 by drops. NaOH dissociates into Na+ and OH-, while H2SO4 dissociates into H+ and HSO4-. Once the number of OH- ions equals the number of H+ ions, the acid is neutralized and the indicator, phenolphthalein, turns bright pink.