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Physical Properties Affecting Solubility02:19

Physical Properties Affecting Solubility

Solutions of Gases in Liquids
As for any solution, the solubility of a gas in a liquid is affected by the attractive intermolecular forces between solute and solvent species. Unlike solid and liquid solutes, however, there is no solute-solute intermolecular attraction to overcome when a gaseous solute dissolves in a liquid solvent since the atoms or molecules comprising a gas are far separated and experience negligible interactions. Consequently, solute-solvent interactions are the sole...
Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
Ions as Acids and Bases02:54

Ions as Acids and Bases

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:
Balancing Redox Equations02:58

Balancing Redox Equations

Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate light...

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A Simple Approach to Manipulate Dissolved Oxygen for Animal Behavior Observations
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水性ヒドロキシド溶液の第一原理の研究

Bin Chen1, Jung Mee Park, Ivaylo Ivanov

  • 1Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA.

Journal of the American Chemical Society
|July 18, 2002
PubMed
まとめ

分子ダイナミクスシミュレーションにより,水にヒドロキシドを加えることで,水の構造とダイナミクスがどのように変化するかが明らかになりました. 水の調整の変化や独特のスペクトル学的特徴を含むこれらの変化は,水酸化物-水複合体の形成に関連しています.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Membraneless Hydrogen Peroxide Fuel Cells as a Promising Clean Energy Source
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科学分野:

  • 物理化学 物理化学について
  • コンピューティング・ケミストリー
  • マテリアルサイエンス 材料科学

背景:

  • ナトリウム水酸化物 (NaOH) とカリウム水酸化物 (KOH) の水溶液は,様々な化学プロセスにおいて不可欠です.
  • これらの溶液の分子レベルの振る舞いを理解することは,産業用アプリケーションの最適化と化学反応の予測に不可欠です.

研究 の 目的:

  • 分子ダイナミクスシミュレーションを用いて,水性NaOHおよびKOH溶液における構造的および動的変化を調査する.
  • 観測された変化を実験データと相関させ,水構造におけるヒドロキシドイオンの役割を明らかにする.

主な方法:

  • Car-Parrinello分子動力学シミュレーションを使用した.
  • 水中のNaOHおよびKOH溶液のシミュレーションは,環境条件下での濃度範囲にわたって行われました.

主要な成果:

  • 酸素-酸素の放射分布機能の連続的なシフトが,水酸化物濃度の増加とともに観察され,水の構造の変化を示した.
  • 純粋な水の特徴的な四面体協調は,高濃度では欠落しており,中性子 difraktion データと一致しています.
  • "自由"のO-H伸縮と振動帯のシフトを含むユニークなスペクトル学的特徴が特定され,実験結果と一致しました.

結論:

  • 水性ヒドロキシド溶液の構造的および動的性質は,ヒドロキシドイオンの存在によって著しく影響を受けます.
  • コンパクトな水酸化物と水の複合体の形成は,観察された構造的および動的変化と密接に関連しています.
  • シミュレーションの結果は,実験観察と一致する貴重な洞察を提供し,これらの重要な解決策についての理解を深めます.