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相关概念视频

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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Molecular Models02:00

Molecular Models

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Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
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Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

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A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
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Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
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Mixtures of Acids03:27

Mixtures of Acids

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The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry
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使用机器学习的原子间电位来模拟缩的水性HNO3的行为.

Mohammadhasan Dinpajooh1, Michael D Lacount2, Scott E Muller2

  • 1Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.

The Journal of chemical physics
|January 6, 2026
PubMed
概括
此摘要是机器生成的。

我们开发了用于酸模拟的机器学习潜力,准确预测其在不同度中的酸度和结构性质. 这些潜力为化学研究的现有模型提供了更快,更准确的替代方案.

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科学领域:

  • 计算化学计算化学
  • 材料科学 材料科学 材料科学
  • 化学物理 化学物理

背景情况:

  • 研究不同度的酸 (HNO3) 的行为对于理解其化学性质至关重要.
  • 现有的计算模型往往难以准确地捕捉酸复杂的结构和热力学特性,特别是关于其解离.
  • 准确和高效的原子间潜力的开发对于分子动力学模拟是必不可少的.

研究的目的:

  • 开发和验证使用DeepMD-kit.使用酸的多缺陷机器学习原子间潜力 (MLIPs).
  • 通过分子动力学 (MD) 模拟,研究酸在广泛度的结构和热力学特性.
  • 为了比较定制的DeepMD MLIP与MACE-MP0和MACE-OFF23等基础模型的性能.

主要方法:

  • 使用BLYP-D2和PBE-D3密度函数理论与DeepMD-kit一起训练两个多缺陷MLIP.
  • 执行MD模拟以调查结构和热力学特性,包括解离度 (α) 和pKa.
  • 将定制的DeepMD MLIP与MACE-MP0和MACE-OFF23进行比较,并与经典的力场 (FF) 进行比较.

主要成果:

  • 开发的MLIP准确地预测了酸的解离度 (α) 和pKa,与实验数据有很好的一致性.
  • 在较高度下,HNO3表现出较弱的酸性行为,标准状态的pKa与实验值相匹配.
  • 定制的DeepMD MLIP提供了更紧的溶解,复制密度度趋势,并且比MACE-MP0快得多,在捕捉微妙的结构特征方面表现优于基础模型.

结论:

  • 定制的反应性MLIP是必要的,以准确模拟化学反应性和解离等性质,超出了普遍的MLIP.
  • 开发的DeepMD MLIP为研究缩酸系统提供了重大进步,提供了准确的预测和更高的计算效率.
  • 虽然经典的FF在密度方面是有效的,但它们缺乏对预测解离和酸度至关重要的化学反应性,这突显了反应性MLIP的价值.