Domanda del libro di testo
Consider the curve shown here for the titration of a weak monoprotic acid with a strong base and answer each question.
c. At what volume of added base does pH = pKa?
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Ch.18 - Aqueous Ionic Equilibrium
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving118
- Ch.2 - Atoms & Elements106
- Ch.3 - Molecules and Compounds131
- Ch.4 - Chemical Reactions and Chemical Quantities56
- Ch.5 - Introduction to Solutions and Aqueous Solutions82
- Ch.6 - Gases114
- Ch.7 - Thermochemistry96
- Ch.8 - The Quantum-Mechanical Model of the Atom60
- Ch.9 - Periodic Properties of the Elements90
- Ch.10 - Chemical Bonding I: The Lewis Model89
- Ch.11 - Chemical Bonding II: Molecular Shapes, VSEPR & MO Theory85
- Ch.12 - Liquids, Solids & Intermolecular Forces51
- Ch.13 - Solids & Modern Materials47
- Ch.14 - Solutions90
- Ch.15 - Chemical Kinetics115
- Ch.16 - Chemical Equilibrium68
- Ch.17 - Acids and Bases136
- Ch.18 - Aqueous Ionic Equilibrium153
- Ch.19 - Free Energy & Thermodynamics93
- Ch.20 - Electrochemistry106
- Ch.21 - Radioactivity & Nuclear Chemistry74
- Ch.22 - Organic Chemistry140
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Capitolo 18, Problema 71d
Consider the curve shown here for the titration of a weak monoprotic acid with a strong base and answer each question.
d. At what volume of added base is the pH calculated by working an equilibrium problem based on the concentration and Kb of the conjugate base?
Guida verificata passo dopo passo1
Identify the equivalence point on the titration curve, where the amount of acid equals the amount of base added.
Recognize that at the equivalence point, the weak acid has been completely converted to its conjugate base.
Understand that beyond the equivalence point, the solution consists of the conjugate base and any excess strong base.
Determine that the pH is calculated using the concentration of the conjugate base and its K_b value, which occurs at the equivalence point.
Calculate the concentration of the conjugate base at the equivalence point using the initial concentration of the weak acid and the volume of the base added.
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Weak Acid and Strong Base Titration
In a titration involving a weak monoprotic acid and a strong base, the weak acid partially dissociates in solution, leading to a gradual increase in pH as the base is added. The equivalence point occurs when the amount of base added neutralizes the acid, resulting in a solution primarily of the conjugate base. Understanding this process is crucial for determining the pH at various points during the titration.
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Percorso guidato
01:09
Strong Acid-Strong Base Titration
Equilibrium and Kb
The equilibrium constant for the base, Kb, is a measure of the strength of the conjugate base formed from the weak acid. When calculating pH at a specific volume of added base, one must consider the equilibrium established between the conjugate base and water, which involves the dissociation of the base and the concentrations of the species in solution. This concept is essential for accurately determining pH in the context of titration.
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03:50Characteristics of Ka and Kb
Henderson-Hasselbalch Equation
The Henderson-Hasselbalch equation relates the pH of a solution to the pKa of the weak acid and the ratio of the concentrations of the conjugate base to the weak acid. This equation is particularly useful in titration scenarios, especially after the equivalence point, where the pH can be calculated based on the concentration of the conjugate base and its Kb. It provides a straightforward method for estimating pH in buffer solutions formed during the titration.
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02:40Henderson-Hasselbalch Equation
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Consider the curve shown here for the titration of a weak base with a strong acid and answer each question.
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Consider the curve shown here for the titration of a weak base with a strong acid and answer each question.
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The graphs labeled (a) and (b) show the titration curves for two equal-volume samples of bases, one weak and one strong. Both titrations were carried out with the same concentration of strong acid.
(ii) Which graph corresponds to the titration of the strong base and which one to the weak base?
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Consider the curve shown here for the titration of a weak base with a strong acid and answer each question.
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