Which of the following statements are correct? I. Equivalent point is the point at which an equivalent amount of the titrant is added. II. The stoichiometric amount of the titrant is not added at the equivalence point of a reaction. III. The point at which the reaction is observed to be complete is called the endpoint. IV. There is no change in the solution's properties at the endpoint of a reaction. A. I, II, and III only B. I and III only C. I, II, and IV only D. I and II only
Which of the following statements are correct? I. Equivalent point is the point at which an equivalent amount of the titrant is added. II. The stoichiometric amount of the titrant is not added at the equivalence point of a reaction. III. The point at which the reaction is observed to be complete is called the endpoint. IV. There is no change in the solution's properties at the endpoint of a reaction. A. I, II, and III only B. I and III only C. I, II, and IV only D. I and II only
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 99AP
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(1) Which of the following statements are correct?
I. Equivalent point is the point at which an equivalent amount of the titrant is added.
II. The stoichiometric amount of the titrant is not added at the equivalence point of a reaction.
III. The point at which the reaction is observed to be complete is called the endpoint.
IV. There is no change in the solution's properties at the endpoint of a reaction.
A. I, II, and III only
B. I and III only
C. I, II, and IV only
D. I and II only
(2) The pKa of aspirin is 3.5. The pH of gastric juice in the human stomach is about 2–3, and that in the small intestine is about 8.0. Aspirin will be:
A. Ionized in the small intestine and almost unionized in the stomach.
B. Unionized in the small intestine and the stomach.
C. Completely ionized in the small intestine and the stomach.
D. Ionized in the stomach and almost unionized in the small intestine.
(3) Why are strong acids generally used as standard solutions in acid-base titrations ?
A. Strong acids form more stable solutions than weak bases do.
B. They can be used to titrate strong as well as weak bases.
C. If we use them, the pH at the equivalence point will always be 7.0.
Salts of strong acids and strong bases do not hydrolyze.
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