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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 61b
18장, 문제 61b

The graphs labeled (a) and (b) show the titration curves for two equal-volume samples of monoprotic acids, one weak and one strong. Both titrations were carried out with the same concentration of strong base.
(ii) Which graph corresponds to the titration of the strong acid and which one to the titration of the weak acid?

검증된 단계별 안내
1
Step 1: Understand the concept of titration curves. A titration curve is a plot of the concentration of the analyte at a given point in the experiment (usually volume of titrant added) versus the pH. The curve will be different for strong and weak acids.
Step 2: Recognize the characteristics of a strong acid titration curve. A strong acid will completely ionize in solution, so the pH will change rapidly with the addition of a small amount of base. This results in a steep, vertical section in the middle of the titration curve.
Step 3: Recognize the characteristics of a weak acid titration curve. A weak acid does not completely ionize in solution, so the pH will change more gradually with the addition of base. This results in a more gradual slope in the middle of the titration curve.
Step 4: Compare the two graphs. The graph with the steeper, more vertical section in the middle corresponds to the titration of the strong acid. The graph with the more gradual slope corresponds to the titration of the weak acid.
Step 5: Make your conclusion. Based on the characteristics of the graphs, you can determine which graph corresponds to the titration of the strong acid and which one corresponds to the titration of the weak acid.

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주요 개념

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

Titration Curves

Titration curves graphically represent the pH changes of a solution as a titrant is added. For strong acids, the curve shows a steep increase in pH near the equivalence point, while weak acids exhibit a more gradual slope due to their incomplete dissociation. Understanding these curves is essential for identifying the nature of the acid being titrated.
추천 영상:
가이드 코스
02:16
Acid-Base Titration Curves

Strong vs. Weak Acids

Strong acids completely dissociate in solution, resulting in a high concentration of hydrogen ions (H+) and a low pH. In contrast, weak acids only partially dissociate, leading to a higher pH at equivalent concentrations. This fundamental difference affects the shape of their titration curves, making it crucial to distinguish between them in titration experiments.
추천 영상:
가이드 코스
02:19
Weak Acid-Strong Base Titration Curve

Equivalence Point

The equivalence point in a titration is reached when the amount of titrant added is stoichiometrically equivalent to the amount of substance in the solution. For strong acids, this point is characterized by a sharp change in pH, while for weak acids, the change is more gradual. Recognizing the equivalence point helps in determining the strength of the acid being analyzed.
추천 영상:
가이드 코스
01:07
At the Equivalence Point
관련 실천
교과서 질문

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교과서 질문

The graphs labeled (a) and (b) show the titration curves for two equal-volume samples of monoprotic acids, one weak and one strong. Both titrations were carried out with the same concentration of strong base.

(i) What is the approximate pH at the equivalence point of each curve?

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교과서 질문

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교과서 질문

Two 25.0-mL samples, one 0.100 M HCl and the other 0.100 M HF, are titrated with 0.200 M KOH. b. Is the pH at the equivalence point for each titration acidic, basic, or neutral?

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교과서 질문

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