Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
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:
Determining the pH of Salt Solutions04:08

Determining the pH of Salt Solutions

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 7. For...
Qualitative Analysis03:46

Qualitative Analysis

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...
Acids, Bases and Neutralization Reactions01:27

Acids, Bases and Neutralization Reactions

Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
Phosphate Buffer01:22

Phosphate Buffer

The phosphate buffer system is a critical biological mechanism for maintaining pH stability in the body. This system operates primarily through two components: sodium dihydrogen phosphate (NaH2PO4), which acts as a weak acid, and sodium hydrogen phosphate (Na2HPO4), which serves as a weak base.
Sodium dihydrogen phosphate does not fully dissociate in neutral or acidic solutions. When a strong base, such as sodium hydroxide (NaOH), is introduced into the solution, sodium dihydrogen phosphate...

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Mechanism-Guided, Data-Driven Discovery of a Dinuclear Gold Catalyst for Promoting Oxidative Addition.

Angewandte Chemie (International ed. in English)·2026
Same author

SITH: A quantum-chemical framework for predicting bond destabilization in stretched molecules.

The Journal of chemical physics·2026
Same author

An efficient and exact reformulation of fourth-order algebraic diagrammatic construction schemes.

The Journal of chemical physics·2026
Same author

Molecular Mechanism of the Oxidative Cleavage of Alkenes by Photoexcited Nitroarenes.

Journal of the American Chemical Society·2026
Same author

RE-ADC: The algebraic diagrammatic construction scheme for the polarization propagator using the retaining-the-excitation-degree partitioning.

The Journal of chemical physics·2026
Same author

Mixed-order schemes for molecular properties employing ADC/ISR.

The Journal of chemical physics·2026

相关实验视频

Updated: Jul 12, 2026

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
09:49

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

Published on: April 2, 2015

迪亚尼四酸盐确实存在作为稳定的实体.

Andreas Dreuw1, Norbert Zint, Lorenz S Cederbaum

  • 1Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, CA 94720-1470, USA. andreas@bastille.cchem.berkeley.edu

Journal of the American Chemical Society
|September 5, 2002
PubMed
概括
此摘要是机器生成的。

在气相中已经确定了稳定的二四甲酸盐,如B . 这些新的密封酸盐结构在电子上是稳定的,并预测可以通过实验观察到.

更多相关视频

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

相关实验视频

Last Updated: Jul 12, 2026

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
09:49

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability

Published on: April 2, 2015

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons
09:04

Recording Gamma Band Oscillations in Pedunculopontine Nucleus Neurons

Published on: September 14, 2016

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants
12:06

Synthesis of High Purity Nonsymmetric Dialkylphosphinic Acid Extractants

Published on: October 19, 2017

科学领域:

  • 无机化学 无机化学 有机化学
  • 计算化学的计算化学
  • 量子化学 是一个量子化学.

背景情况:

  • 克洛索酸盐是一种具有独特结构的无机化合物.
  • B(6)H(6)(2-) 是已知最小的冷凝相中的稳定密封酸盐.
  • 之前没有观察到稳定的二四酸盐.

研究的目的:

  • 为了研究二氧化四甲基乙烯酸的气相稳定性B(4)X(4)(2-) (X = H,CN,NC,或BO).
  • 识别稳定的同位素并了解它们的电子性质.

主要方法:

  • 最初的电子结构计算.
  • 迪亚尼子结构的几何优化.
  • 电子稳定性和碎片化通道的分析.

主要成果:

  • B的四面体异构体 ((4) X ((4) 2-) 在几何上稳定,但在电子上不稳定.
  • 确定了新的D(2)(d) -对称异构体,具有封闭外单元基态.
  • 发现B(4)(CN)(4)(2-) 和B(4)(BO)(4)(2-) 是稳定的气相二离子.
  • 稳定性归因于电子对电子排斥和芳香性.

结论:

  • 在气相中存在新的,稳定的二四乙烯酸乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基乙烯基.
  • 这些发现挑战了关于二酸的稳定性的先前假设.
  • 已确定的D(2)(d) - 对称异构体是实验观察的有希望的候选者.