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Ch.16 - Acid-Base Equilibria
Brown - Chemistry: The Central Science 15th Edition
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 15th EditionCh.16 - Acid-Base EquilibriaProblema 88d
Capitolo 16, Problema 88d

Predict whether aqueous solutions of the following substances are acidic, basic, or neutral: (d) 3CH3NH34NO3

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Identify the cation and anion in the compound 3CH3NH3NO3. The cation is CH3NH3+ (methylammonium ion) and the anion is NO3- (nitrate ion).
Determine the nature of the cation CH3NH3+. Methylammonium is a derivative of ammonia (NH3), which is a weak base. The conjugate acid of a weak base (CH3NH3+) is typically a weak acid.
Assess the nature of the anion NO3-. Nitrate is the conjugate base of nitric acid (HNO3), which is a strong acid. The conjugate base of a strong acid is neutral in water.
Combine the effects of the cation and anion in solution. Since the cation (CH3NH3+) acts as a weak acid and the anion (NO3-) is neutral, the overall solution is expected to be slightly acidic.
Conclude that the aqueous solution of 3CH3NH3NO3 is acidic due to the presence of the weakly acidic cation.

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Acid-Base Theory

Acid-base theory explains the behavior of substances in terms of their ability to donate protons (H+) or accept protons. According to the Brønsted-Lowry theory, acids are proton donors, while bases are proton acceptors. Understanding this concept is crucial for predicting the pH of solutions formed by different substances.
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02:08
Bronsted-Lowry Acid-Base Theory

Ammonium Compounds

Ammonium compounds, such as CH3NH3NO3, contain the ammonium ion (NH4+), which can act as a weak acid in solution. When dissolved in water, ammonium ions can donate protons, leading to an increase in the concentration of H+ ions, thus making the solution acidic. Recognizing the behavior of ammonium ions is essential for determining the acidity of the solution.
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Ionic Compounds Naming

pH Scale

The pH scale measures the acidity or basicity of a solution, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral. A solution with a pH less than 7 is considered acidic, while a pH greater than 7 is basic. Understanding the pH scale is vital for predicting the nature of solutions formed by different chemical substances.
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The pH Scale
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