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Related Concept Videos

Ions as Acids and Bases02:54

Ions as Acids and Bases

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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

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The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution.  In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than...
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Qualitative Analysis03:46

Qualitative Analysis

22.0K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.5K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
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Related Experiment Video

Updated: Jun 9, 2025

Facile Preparation of Ultrafine Aluminum Hydroxide Particles with or without Mesoporous MCM-41 in Ambient Environments
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Anomalous Water Penetration in Al3+ Dissolution.

Minwoo Kim1, Seungtae Kim1, Changbong Hyeon2

  • 1School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.

The Journal of Physical Chemistry Letters
|October 24, 2024
PubMed
Summary

Machine learning force fields reveal novel hydration dynamics for trivalent aluminum ions (Al3+). Water molecules beyond the second shell coordinate directly to Al3+, offering new insights into ion solvation.

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Area of Science:

  • Computational Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Physicochemical characterization of trivalent ions is challenging due to limitations in accurate force fields.
  • Understanding ion hydration is crucial for various chemical and biological processes.

Purpose of the Study:

  • To investigate the hydration process of trivalent aluminum ions (Al3+) in aqueous solution.
  • To explore the role of water molecules beyond the second hydration shell in ion solvation.
  • To develop a novel microscopic understanding of solvation dynamics for trivalent ions.

Main Methods:

  • Utilized a state-of-the-art machine learning force field for modeling aqueous aluminum chloride (AlCl3).
  • Simulated the dissolution of Al3+ ions in water to observe hydration shell dynamics.
  • Analyzed the motion and coordination of water molecules using computational methods.

Main Results:

  • Discovered that water molecules beyond the second hydration shell actively participate in the Al3+ hydration process.
  • Observed a coordinated motion of water molecules in the second solvation shell driven by hydrogen bonding.
  • Demonstrated that these outer-shell water molecules penetrate the second shell to coordinate with the Al3+ ion.

Conclusions:

  • The study provides a novel microscopic understanding of solvation dynamics for trivalent ions.
  • Machine learning force fields enable accurate modeling of complex hydration phenomena.
  • Revealed an extended hydration network for Al3+ involving water molecules beyond the conventional second shell.