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.17 - Aqueous Ionic Equilibrium
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831
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TOC.tableOfContents
- Ch.1 - Matter, Measurement & Problem Solving136
- Ch.2 - Atoms & Elements112
- Ch.3 - Molecules, Compounds & Chemical Equations159
- Ch.4 - Chemical Quantities & Aqueous Reactions140
- Ch.5 - Gases118
- Ch.6 - Thermochemistry106
- Ch.7 - Quantum-Mechanical Model of the Atom62
- Ch.8 - Periodic Properties of the Elements103
- Ch.9 - Chemical Bonding I: The Lewis Model104
- Ch.10 - Chemical Bonding II: Molecular Shapes & Valence Bond Theory89
- Ch.11 - Liquids, Solids & Intermolecular Forces73
- Ch.12 - Solids and Modern Material59
- Ch.13 - Solutions110
- Ch.14 - Chemical Kinetics140
- Ch.15 - Chemical Equilibrium78
- Ch.16 - Acids and Bases155
- Ch.17 - Aqueous Ionic Equilibrium176
- Ch.18 - Free Energy and Thermodynamics108
- Ch.19 - Electrochemistry118
- Ch.20 - Radioactivity and Nuclear Chemistry82
- Ch.21 - Organic Chemistry150
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Non è quello che usi tu?Cambia libro di testo
Capitolo 17, Problema 63c
Two 20.0-mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, are titrated with 0.100 M HI. c. Which titration curve has the lower initial pH?
Guida verificata passo dopo passo1
insert step 1> Determine the nature of the solutions: KOH is a strong base, while CH3NH2 is a weak base.
insert step 2> Understand that the initial pH of a solution is determined by the concentration and strength of the base.
insert step 3> Calculate the initial pH of the KOH solution: Since KOH is a strong base, it completely dissociates in water. Use the formula pH = 14 - pOH, where pOH = -\(\log\)[OH^-].
insert step 4> Calculate the initial pH of the CH3NH2 solution: As a weak base, CH3NH2 partially dissociates. Use the base dissociation constant (Kb) to find [OH^-] and then calculate pOH and pH.
insert step 5> Compare the initial pH values of both solutions: The solution with the lower pH will have the lower initial pH on the titration curve.
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Acid-Base Titration
An acid-base titration is a quantitative analytical method used to determine the concentration of an acid or base in a solution. During the titration, a solution of known concentration (the titrant) is added to a solution of unknown concentration until the reaction reaches its equivalence point, where the amount of acid equals the amount of base. The pH of the solution changes throughout the titration, and the resulting curve can provide insights into the strengths of the acids and bases involved.
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Percorso guidato
03:04
Acid-Base Titration
pH Scale
The pH scale measures the acidity or basicity of a solution, ranging from 0 to 14. A pH less than 7 indicates an acidic solution, while a pH greater than 7 indicates a basic solution. The pH is logarithmically related to the concentration of hydrogen ions (H+) in the solution, meaning that each whole number change on the scale represents a tenfold change in acidity. Understanding the initial pH of the solutions being titrated is crucial for predicting the behavior of the titration curve.
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02:33The pH Scale
Weak Base vs. Strong Base
In this context, KOH is a strong base that completely dissociates in solution, while CH3NH2 (methylamine) is a weak base that only partially dissociates. The initial pH of a strong base solution is typically higher than that of a weak base solution due to the complete ionization of the strong base. This difference in dissociation affects the initial pH of the solutions before titration begins, which is essential for determining which titration curve will have a lower initial pH.
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Percorso guidato
02:22Strong vs Weak Bases
Pratica correlata
Domanda del libro di testo
Two 20.0-mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, are titrated with 0.100 M HI. b. Is the pH at the equivalence point for each titration acidic, basic, or neutral?
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Domanda del libro di testo
Two 20.0-mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, are titrated with 0.100 M HI. a. What is the volume of added acid at the equivalence point for each titration?
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Domanda del libro di testo
Two 20.0-mL samples, one 0.200 M KOH and the other 0.200 M CH3NH2, are titrated with 0.100 M HI. d. Sketch each titration curve.
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Domanda del libro di testo
Two 25.0-mL samples, one 0.100 M HCl and the other 0.100 M HF, are titrated with 0.200 M KOH.
d. Sketch each titration curve.
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Domanda del libro di testo
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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