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相关概念视频

Common Ion Effect03:24

Common Ion Effect

41.7K
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:
41.7K
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

14.7K
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.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.7K
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

33.6K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
33.6K
Factors Affecting Solubility04:01

Factors Affecting Solubility

33.4K
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 Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.4K
Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
1.5K
Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

60.6K
Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
60.6K

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相关实验视频

Updated: Jun 30, 2025

Sulfate Separation by Selective Crystallization with a Bis-iminoguanidinium Ligand
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从盐接口中单个离子的受控溶解.

Huijun Han1, Yunjae Park2, Yohan Kim1

  • 1Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Nature communications
|March 17, 2024
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概括

研究人员操纵单个水分子,观察化 (NaCl) 膜表面的盐溶解. 这项研究揭示了对基本的离子-水相互作用和选择性离子溶解过程的关键见解.

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On-chip Isotachophoresis for Separation of Ions and Purification of Nucleic Acids
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科学领域:

  • 表面科学是一门科学.
  • 物理化学 物理化学
  • 材料科学是一种材料科学.

背景情况:

  • 了解离子-水相互作用对于复杂的离子过程至关重要.
  • 盐溶解是一种基本的内热过程,需要增加.
  • 以前的单离子水平研究主要是理论性的.

研究的目的:

  • 在单离子水平上实验证明盐溶解.
  • 为了研究离子-水相互作用和水分子动态在接口.
  • 为了阐明选择性离子溶解的机制.

主要方法:

  • 在化 (NaCl) 膜上对单个水分子进行受控的操纵.
  • 在一个协调不足的地点观察盐溶解.
  • 分析水双极极化及其对离子键的影响.

主要成果:

  • 通过操纵单个水分子来证明盐溶解.
  • 观察到阴离子的水双极极化,导致强烈的阴离子-水相互作用.
  • 显示了NaCl晶体内的离子键因水相互作用而减弱.

结论:

  • 提供了对单离子化学的一个基本步骤的实验洞察.
  • 突出了水分子动态在选择性离子溶解中的作用.
  • 在与离子相关的科学和技术中提供了潜在的应用.