Sulfuric acid

In this simple titration, one graduated cylinder contains 100 mL of sodium hydroxide. The other cylinder contains 40 mL of sulfuric acid ( a diprotic strong acid). The 40mL sample of sulfuric acid is poured into a beaker and a small quantity of indicator is added. The molar concentrations of the two solutions are approximately equal. The solution is stirred as sodium hydroxide is carefully poured from the graduated cylinder into the beaker. As the sodium hydroxide is added, the indicator color begins to change to pink. When a permanent pink color develops, the titration is stopped. The level of sodium hydroxide in the graduated cylinder shows that about 81mL of sodium hydroxide were used to titrate the 40mL sample of sulfuric acid.

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© 1997 Division of Chemical Education, Inc., American Chemical Society. All rights reserved.