Domanda del libro di testo
Predict whether the equivalence point of each of the following titrations is below, above, or at pH 7: (b) calcium hydroxide titrated with perchloric acid.
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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
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
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Brown 14th EditionCh.17 - Additional Aspects of Aqueous EquilibriaProblema 38a
Brown 14th EditionCh.17 - Additional Aspects of Aqueous EquilibriaProblema 38aCapitolo 17, Problema 38a
Predict whether the equivalence point of each of the following titrations is below, above, or at pH 7: (a) formic acid titrated with NaOH.
Guida verificata passo dopo passo1
Identify the type of acid and base involved in the titration. Formic acid (HCOOH) is a weak acid, and NaOH is a strong base.
Understand that the equivalence point in a titration is where the amount of acid equals the amount of base added.
Recognize that when a weak acid is titrated with a strong base, the equivalence point will be above pH 7. This is because the conjugate base of the weak acid (formate ion, HCOO⁻) will hydrolyze in water to produce OH⁻ ions, making the solution basic.
Consider the reaction: HCOOH + OH⁻ → HCOO⁻ + H₂O. At the equivalence point, all the formic acid has been converted to its conjugate base, HCOO⁻.
Conclude that the equivalence point for the titration of formic acid with NaOH will be above pH 7 due to the basic nature of the solution at this point.
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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 at this point can vary depending on the nature of the acid and base involved.
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Percorso guidato
03:04
Acid-Base Titration
Equivalence Point and pH
The equivalence point in a titration is the stage at which the number of moles of titrant equals the number of moles of the substance being titrated. The pH at the equivalence point is influenced by the strength of the acid and base. For strong acid-strong base titrations, the pH is typically 7, while for weak acid-strong base titrations, the pH is above 7, and for strong acid-weak base titrations, it is below 7.
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Percorso guidato
07:28pH at the Equivalence Point Example
Weak Acid Behavior
Formic acid is a weak acid, meaning it does not completely dissociate in solution. When titrated with a strong base like NaOH, the resulting solution at the equivalence point will contain the conjugate base of the weak acid, which can hydrolyze to produce hydroxide ions, leading to a pH greater than 7. This behavior is crucial for predicting the pH at the equivalence point in titrations involving weak acids.
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00:44ICE Charts of Weak Acids
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