교과서 질문
Match the following descriptions of titration curves with the diagrams: (a) strong acid added to strong base. [Section 17.3]
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Ch.17 - Additional Aspects of Aqueous Equilibria
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement177
- Ch.2 - Atoms, Molecules, and Ions231
- Ch.3 - Chemical Reactions and Reaction Stoichiometry216
- Ch.4 - Reactions in Aqueous Solution189
- Ch.5 - Thermochemistry175
- Ch.6 - Electronic Structure of Atoms168
- Ch.7 - Periodic Properties of the Elements150
- Ch.8 - Basic Concepts of Chemical Bonding177
- Ch.9 - Molecular Geometry and Bonding Theories200
- Ch.10 - Gases179
- Ch.11 - Liquids and Intermolecular Forces113
- Ch.12 - Solids and Modern Materials154
- Ch.13 - Properties of Solutions157
- Ch.14 - Chemical Kinetics199
- Ch.15 - Chemical Equilibrium128
- Ch.16 - Acid-Base Equilibria164
- Ch.17 - Additional Aspects of Aqueous Equilibria163
- Ch.18 - Chemistry of the Environment105
- Ch.19 - Chemical Thermodynamics164
- Ch.20 - Electrochemistry171
- Ch.21 - Nuclear Chemistry122
- Ch.22 - Chemistry of the Nonmetals82
- Ch.23 - Transition Metals and Coordination Chemistry79
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry16
17장, 문제 4c
The following diagram represents a buffer composed of equal concentrations of a weak acid, HA, and its conjugate base, A-. The heights of the columns are proportional to the concentrations of the components of the buffer. (c) Which of the three represents a situation that cannot arise from the addition of either an acid or a base? [Section 17.2]
검증된 단계별 안내1
Identify the components of the buffer system: a weak acid (HA) and its conjugate base (A-).
Understand that a buffer resists changes in pH upon the addition of small amounts of acid or base.
Recognize that the buffer capacity is optimal when the concentrations of HA and A- are equal.
Consider the effect of adding a strong acid: it will increase the concentration of HA and decrease the concentration of A-.
Consider the effect of adding a strong base: it will increase the concentration of A- and decrease the concentration of HA.
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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
1m주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Buffer Solutions
A buffer solution is a system that resists changes in pH upon the addition of small amounts of acid or base. It typically consists of a weak acid and its conjugate base in equilibrium, allowing it to neutralize added acids or bases. This property is crucial for maintaining stable pH levels in various chemical and biological processes.
추천 영상:
가이드 코스
03:02
Buffer Solutions
Weak Acids and Conjugate Bases
Weak acids partially dissociate in solution, establishing an equilibrium between the undissociated acid (HA) and its ions (H+ and A-). The conjugate base (A-) can react with added acids, while the weak acid can react with added bases, making the buffer effective in maintaining pH. Understanding this equilibrium is essential for analyzing buffer behavior.
추천 영상:
가이드 코스
01:46Conjugate Acid-Base Relationships
pH and its Relationship to Buffer Capacity
The pH of a buffer solution is determined by the ratio of the concentrations of the weak acid and its conjugate base. When an acid or base is added, the buffer's capacity to maintain pH depends on the relative amounts of HA and A-. A situation where the concentrations of HA and A- are equal allows the buffer to effectively neutralize added acids or bases, but extreme changes can lead to a failure in buffering capacity.
추천 영상:
가이드 코스
00:45Buffer Capacity
관련 실천
교과서 질문
The following figure represents solutions at various stages of the titration of a weak acid, HA, with NaOH. (The Na+ ions and water molecules have been omitted for clarity.) To which of the following regions of the titration curve does each drawing correspond: (b) after addition of NaOH but before the equivalence point? [Section 17.3]
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교과서 질문
The following diagram represents a buffer composed of equal concentrations of a weak acid, HA, and its conjugate base, A-. The heights of the columns are proportional to the concentrations of the components of the buffer. (a) Which of the three drawings, (1), (2), or (3), represents the buffer after the addition of a strong acid? [Section 17.2]
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교과서 질문
The beaker on the right contains 0.1 M acetic acid solution with methyl orange as an indicator. The beaker on the left contains a mixture of 0.1 M acetic acid and 0.1 M sodium acetate with methyl orange. (b) Which solution is better able to maintain its pH when small amounts of NaOH are added? Explain. [Sections 17.1 and 17.2]
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교과서 질문
A buffer contains a weak acid, HA, and its conjugate base. The weak acid has a pKa of 4.5, and the buffer has a pH of 4.3. Without doing a calculation, state which of these possibilities are correct at pH 4.3. (a) 3HA4 = 3A-4, (b) 3HA4 7 3A-4, or (c) 3HA4 6 3A-4. [Section 17.2]
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