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Ch.17 - Acids and Bases
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 5th EditionCh.17 - Acids and BasesProblema 36b
Capitolo 17, Problema 36b

In each reaction, identify the Brønsted–Lowry acid, the Brønsted–Lowry base, the conjugate acid, and the conjugate base. b. CH3NH2(aq) + H2O(l) ⇌ CH3NH3+(aq) + OH–(aq)

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Identify the Brønsted–Lowry acid and base in the reactants: The Brønsted–Lowry acid is the species that donates a proton (H+), and the Brønsted–Lowry base is the species that accepts a proton.
In the reaction CH3NH2(aq) + H2O(l) -> CH3NH3+(aq) + OH-(aq), identify which species donates a proton and which accepts it.
CH3NH2 is the Brønsted–Lowry base because it accepts a proton from H2O, forming CH3NH3+.
H2O is the Brønsted–Lowry acid because it donates a proton to CH3NH2, forming OH-.
Identify the conjugate acid and conjugate base: The conjugate acid is the species formed when the base gains a proton, and the conjugate base is the species formed when the acid loses a proton. CH3NH3+ is the conjugate acid, and OH- is the conjugate base.

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Brønsted–Lowry Acid-Base Theory

The Brønsted–Lowry theory defines acids as proton donors and bases as proton acceptors. In this framework, an acid-base reaction involves the transfer of protons (H+) from the acid to the base. This theory expands the understanding of acid-base reactions beyond just the presence of hydroxide ions, allowing for a broader range of substances to be classified as acids or bases.
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02:08
Bronsted-Lowry Acid-Base Theory

Conjugate Acid and Conjugate Base

In the context of Brønsted–Lowry theory, a conjugate acid is formed when a base accepts a proton, while a conjugate base is formed when an acid donates a proton. These pairs are related; for every acid, there is a corresponding conjugate base, and for every base, there is a corresponding conjugate acid. Understanding these relationships is crucial for analyzing acid-base reactions.
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Conjugate Acid-Base Pairs

Identifying Species in Reactions

To analyze acid-base reactions, it is essential to identify the reactants and products involved. In the given reaction, CH3NH2 acts as a base by accepting a proton from water (H2O), which acts as an acid. The products, CH3NH3+ and OH-, represent the conjugate acid and conjugate base, respectively. Recognizing these roles is key to understanding the dynamics of the reaction.
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Amphoteric Species
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