**Question:**What is the purpose of phenolphthalein in an acid-base titration?**Options:**- It marks when the moles of acid are equal to the moles of base- It marks when the mL of acid are equal to the mL of base- It acts as a catalyst for the reaction- It turns pink in acid**Explanation:**Phenolphthalein is commonly used as an indicator in acid-base titrations. It provides a visual indication of the endpoint of the titration by changing color. Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions. Its color change occurs at a pH range of approximately 8.2 to 10. This allows chemists to determine when the amount of acid is stoichiometrically equal to the amount of base, marking the endpoint of the titration. This does not mean equal moles or volume, but rather the point at which the reaction is complete. Therefore, the correct purpose related to the given options is not directly listed.

The reaction of acid and base in presence of an indicator in the laboratory is called titration. The…

What is the purpose of phenolphthalein in an acid base titration? It marks when the moles of acid are equal to the moles of base It marks when the mL of acid are equal to the mL of base It acts as a catalyst for the reaction It turns pink in acid

What is the purpose of phenolphthalein in an acid base titration? It marks when the moles of acid are equal to the moles of base It marks when the mL of acid are equal to the mL of base It acts as a catalyst for the reaction It turns pink in acid

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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