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Ch.18 - Aqueous Ionic Equilibrium
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 5th EditionCh.18 - Aqueous Ionic Equilibrium문제 76
18장, 문제 76

Consider the titration curves (labeled a and b) for two weak bases, both titrated with 0.100 M HCl. (a)
Titration curves of two weak bases with 0.100 M HCl, showing pH changes over volume added.


(b)

(ii) Which base has the larger Kb?

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1
Identify the initial pH of both titration curves. The initial pH is higher for the base with the larger Kb.
Observe the shape of the titration curves. The curve with a more gradual slope before the equivalence point indicates a weaker base.
Determine the volume of HCl added at the equivalence point for both curves. The equivalence point occurs where the pH drops sharply.
Compare the pH at the equivalence point for both curves. The base with the higher pH at the equivalence point has a larger Kb.
Conclude which base has the larger Kb by comparing the initial pH and the pH at the equivalence point for both titration curves.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Titration Curves

Titration curves graphically represent the change in pH of a solution as a titrant is added. In this case, the weak bases are being titrated with a strong acid (HCl), leading to a characteristic S-shaped curve. The steepest part of the curve indicates the equivalence point, where the amount of acid equals the amount of base present, and the pH changes rapidly.
추천 영상:
가이드 코스
02:16
Acid-Base Titration Curves

Weak Base and Kb

Weak bases partially dissociate in solution, establishing an equilibrium between the base and its conjugate acid. The base dissociation constant (Kb) quantifies this equilibrium, with larger Kb values indicating a stronger weak base that dissociates more in solution. Comparing the titration curves can help determine which base has a larger Kb based on the steepness and position of the pH change.
추천 영상:
가이드 코스
00:51
ICE Charts of Weak Bases

Equivalence Point

The equivalence point in a titration is reached when the amount of titrant added is stoichiometrically equivalent to the amount of substance being titrated. For weak bases titrated with a strong acid, this point is characterized by a significant drop in pH. Analyzing the pH at the equivalence point can provide insights into the strength of the base and its Kb value.
추천 영상:
가이드 코스
01:07
At the Equivalence Point
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