Domanda del libro di testo
Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (a) AlCl3
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Ch.16 - Acid-Base Equilibria
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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TOC.tableOfContents
- Ch.1 - Introduction: Matter, Energy, and Measurement146
- Ch.2 - Atoms, Molecules, and Ions200
- Ch.3 - Chemical Reactions and Reaction Stoichiometry176
- Ch.4 - Reactions in Aqueous Solution155
- Ch.5 - Thermochemistry126
- Ch.6 - Electronic Structure of Atoms131
- Ch.7 - Periodic Properties of the Elements126
- Ch.8 - Basic Concepts of Chemical Bonding123
- Ch.9 - Molecular Geometry and Bonding Theories143
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces91
- Ch.12 - Solids and Modern Materials122
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics174
- Ch.15 - Chemical Equilibrium101
- Ch.16 - Acid-Base Equilibria139
- Ch.17 - Additional Aspects of Aqueous Equilibria146
- Ch.18 - Chemistry of the Environment72
- Ch.19 - Chemical Thermodynamics129
- Ch.20 - Electrochemistry142
- Ch.21 - Nuclear Chemistry101
- Ch.22 - Chemistry of the Nonmetals68
- Ch.23 - Transition Metals and Coordination Chemistry66
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry10
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Capitolo 16, Problema 86b
Pyridinium bromide 1C5H5NHBr2 is a strong electrolyte that dissociates completely into C5H5NH+ and Br-. An aqueous solution of pyridinium bromide has a pH of 2.95. (b) Using Appendix D, calculate the Ka for pyridinium bromide.
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Identify the species in solution: Pyridinium bromide dissociates into \( \text{C}_5\text{H}_5\text{NH}^+ \) and \( \text{Br}^- \). The \( \text{C}_5\text{H}_5\text{NH}^+ \) acts as a weak acid in water.
Write the equilibrium expression for the dissociation of \( \text{C}_5\text{H}_5\text{NH}^+ \): \( \text{C}_5\text{H}_5\text{NH}^+ + \text{H}_2\text{O} \rightleftharpoons \text{C}_5\text{H}_5\text{N} + \text{H}_3\text{O}^+ \).
Use the pH to find the concentration of \( \text{H}_3\text{O}^+ \): \( \text{[H}_3\text{O}^+] = 10^{-\text{pH}} \).
Assume that the initial concentration of \( \text{C}_5\text{H}_5\text{NH}^+ \) is equal to the concentration of \( \text{H}_3\text{O}^+ \) at equilibrium, since the solution is dilute.
Calculate \( K_a \) using the expression \( K_a = \frac{[\text{C}_5\text{H}_5\text{N}][\text{H}_3\text{O}^+]}{[\text{C}_5\text{H}_5\text{NH}^+]} \), where the concentrations of \( \text{C}_5\text{H}_5\text{N} \) and \( \text{H}_3\text{O}^+ \) are equal to the \( \text{H}_3\text{O}^+ \) concentration found from the pH.
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Strong Electrolytes
Strong electrolytes are substances that completely dissociate into ions when dissolved in water. This means that they produce a high concentration of ions in solution, which is crucial for understanding their behavior in chemical reactions and their effect on properties like conductivity and pH.
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02:50
Electrolytes and Strong Acids
pH and Acidity
pH is a measure of the hydrogen ion concentration in a solution, indicating its acidity or basicity. A lower pH value, such as 2.95, signifies a more acidic solution, which is relevant for calculating the dissociation of weak acids and their equilibrium constants, such as Ka.
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02:39pH of Strong Acids and Bases
Acid Dissociation Constant (Ka)
The acid dissociation constant (Ka) quantifies the strength of an acid in solution, representing the equilibrium between the undissociated acid and its ions. It is calculated using the concentrations of the products and reactants at equilibrium, and is essential for understanding the behavior of weak acids in solution.
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03:50Characteristics of Ka and Kb
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Domanda del libro di testo
Pyridinium bromide 1C5H5NHBr2 is a strong electrolyte that dissociates completely into C5H5NH+ and Br-. An aqueous solution of pyridinium bromide has a pH of 2.95. (c) A solution of pyridinium bromide has a pH of 2.95. What is the concentration of the pyridinium cation at equilibrium, in units of molarity?
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Predict whether aqueous solutions of the following compounds are acidic, basic, or neutral: (c) Na2CO3
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Pyridinium bromide 1C5H5NHBr2 is a strong electrolyte that dissociates completely into C5H5NH+ and Br-. An aqueous solution of pyridinium bromide has a pH of 2.95. (a) Write out the reaction that leads to this acidic pH.
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