Domanda del libro di testo
The following plot shows two pH titration curves, each representing the titration of 50.0 mL of 0.100 M acid with 0.100 M NaOH:
. (b) What is the approximate pH at the equivalence point for each of the acids?
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Ch.17 - Applications of Aqueous Equilibria
McMurry8th EditionChemistryISBN: 9781292336145
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TOC.tableOfContents
- Ch.1 - Chemical Tools: Experimentation & Measurement170
- Ch.2 - Atoms, Molecules & Ions160
- Ch.3 - Mass Relationships in Chemical Reactions169
- Ch.4 - Reactions in Aqueous Solution199
- Ch.5 - Periodicity & Electronic Structure of Atoms102
- Ch.6 - Ionic Compounds: Periodic Trends and Bonding Theory92
- Ch.7 - Covalent Bonding and Electron-Dot Structures61
- Ch.8 - Covalent Compounds: Bonding Theories and Molecular Structure59
- Ch.9 - Thermochemistry: Chemical Energy122
- Ch.10 - Gases: Their Properties & Behavior155
- Ch.11 - Liquids & Phase Changes54
- Ch.12 - Solids and Solid-State Materials73
- Ch.13 - Solutions & Their Properties120
- Ch.14 - Chemical Kinetics98
- Ch.15 - Chemical Equilibrium125
- Ch.16 - Aqueous Equilibria: Acids & Bases110
- Ch.17 - Applications of Aqueous Equilibria147
- Ch.18 - Thermodynamics: Entropy, Free Energy & Equilibrium86
- Ch.19 - Electrochemistry154
- Ch.20 - Nuclear Chemistry96
- Ch.21 - Transition Elements and Coordination Chemistry156
- Ch.22 - The Main Group Elements187
- Ch.23 - Organic and Biological Chemistry51
Capitolo 17, Problema 41a
The following plot shows two pH titration curves, each representing the titration of 50.0 mL of 0.100 M acid with 0.100 M NaOH:
. (a) Which of the two curves represents the titration of a strong acid? Which represents a weak acid?
Guida verificata passo dopo passo1
Identify the initial pH of each curve. The curve with the lower initial pH represents the strong acid, while the curve with the higher initial pH represents the weak acid.
Observe the shape of the titration curves. The strong acid will have a more pronounced and steeper vertical section at the equivalence point compared to the weak acid.
Determine the pH at the equivalence point. For a strong acid titration, the pH at the equivalence point will be around 7, while for a weak acid, it will be above 7.
Compare the buffering regions before the equivalence point. The weak acid will show a more significant buffering region, indicated by a more gradual slope before the steep rise.
Conclude which curve represents the strong acid and which represents the weak acid based on the initial pH, shape of the curve, pH at the equivalence point, and buffering regions.
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Titration Curves
Titration curves graphically represent the change in pH of a solution as a titrant is added. The shape of the curve indicates the strength of the acid or base being titrated. A steep rise in pH indicates a strong acid or base, while a more gradual slope suggests a weak acid or base. The equivalence point, where the amount of titrant equals the amount of substance being titrated, is crucial for determining the strength of the acid or base.
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Percorso guidato
02:16
Acid-Base Titration Curves
Strong vs. Weak Acids
Strong acids, such as hydrochloric acid (HCl), completely dissociate in water, resulting in a sharp increase in pH during titration. In contrast, weak acids, like acetic acid (CH₃COOH), only partially dissociate, leading to a more gradual pH change. This difference in dissociation behavior is reflected in the titration curves, where strong acids show a steep slope at the equivalence point, while weak acids exhibit a more gradual slope.
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02:19Weak Acid-Strong Base Titration Curve
pH and Neutralization
pH is a measure of the acidity or basicity of a solution, with lower values indicating acidic conditions and higher values indicating basic conditions. During a titration, the goal is to reach a neutralization point, where the acid and base completely react. The pH at this point can vary depending on whether a strong or weak acid is involved, influencing the shape of the titration curve and the final pH after the addition of the titrant.
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02:33The pH Scale
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Domanda del libro di testo
The following pictures represent solutions that contain one or more of the compounds H2A, NaHA, and Na2A, where H2A is a weak diprotic acid. (Na+ ions and solvent water molecules have been omitted for clarity.)
(b) Which solution has the greatest buffer capacity?
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Domanda del libro di testo
The following pictures represent solutions that contain one or more of the compounds H2A, NaHA, and Na2A, where H2A is a weak diprotic acid. (Na+ ions and solvent water molecules have been omitted for clarity.)
(a) Which of the solutions are buffer solutions?
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Domanda del libro di testo
The following pictures represent solutions at various stages in the titration of a weak base B with aqueous HCl. (Cl- ions and solvent water molecules have been omitted for clarity.)
. (a) To which of the following stages do solutions 1–4 correspond? (i) The initial solution before addition of any HCl (ii) Halfway to the equivalence point (iii) At the equivalence point (iv) Beyond the equivalence point
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Domanda del libro di testo
The following pictures represent initial concentrations in solutions that contain a weak acid HA (pKa = 6.0) and its sodium salt NaA. (Na+ ions and solvent water molecules have been omitted for clarity.)
. (b) Draw a picture that represents the equilibrium state of solution (1) after the addition of two H3O+ ions.
499
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Domanda del libro di testo
The following plot shows two pH titration curves, each representing the titration of 50.0 mL of 0.100 M acid with 0.100 M NaOH:
. (c) What is the approximate pKa of the weak acid?
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