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相关概念视频

Indicators02:39

Indicators

48.6K
Certain organic substances change color in dilute solution when the hydronium ion concentration reaches a particular value. For example, phenolphthalein is a colorless substance in any aqueous solution with a hydronium ion concentration greater than 5.0 × 10−9 M (pH < 8.3). In more basic solutions where the hydronium ion concentration is less than 5.0 × 10−9 M (pH > 8.3), it is red or pink. Substances such as phenolphthalein, which can be used to determine the pH of a solution, are...
48.6K
Titration of a Weak Acid with a Weak Base01:08

Titration of a Weak Acid with a Weak Base

2.8K
Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...
2.8K
Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

31.7K
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.
31.7K
Titration of a Strong Acid with a Strong Base01:23

Titration of a Strong Acid with a Strong Base

5.4K
During the titration of a strong acid with a strong base, pH calculations are primarily based on the concentration of residual hydronium or hydroxide ions. Initially, a strong acid like hydrochloric acid fully dissociates, creating hydronium and chloride ions, resulting in a low pH. The addition of a strong base like sodium hydroxide alters the concentration of hydronium ions by neutralizing them. As more base is added, the pH gradually increases. At the equivalence point, all hydronium ions...
5.4K
Titration of a Weak Acid with a Strong Base01:30

Titration of a Weak Acid with a Strong Base

2.2K
In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...
2.2K
Titration Calculations: Weak Acid - Strong Base03:55

Titration Calculations: Weak Acid - Strong Base

44.3K
Calculating pH for Titration Solutions: Weak Acid/Strong Base
For the titration of 25.00 mL of 0.100 M CH3CO2H with 0.100 M NaOH, the reaction can be represented as:
44.3K

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相关实验视频

Updated: Jun 25, 2025

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

Published on: June 10, 2021

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强分子基的pH指标:一种理论方法.

Andrey V Kulsha1, Oleg A Ivashkevich2

  • 1Belarusian State University, 4 Nezavisimosti Avenue, Minsk 220030, Republic of Belarus.

The journal of physical chemistry. A
|May 31, 2024
PubMed
概括

本研究在理论上探讨了使用新型酸指标在六甲基胺 (HMPA) 中的过渡点. 设计了新的指标,为非常基本的HMPA解决方案建立了一个基本度表.

科学领域:

  • 化学 化学 化学
  • 物理化学 物理化学
  • 分析化学 分析化学

背景情况:

  • 甲基胺 (HMPA) 是一种具有高度的独特溶剂.
  • 了解HMPA中的过渡点对于其在酸化学中的应用至关重要.
  • 现有的基本性尺度对于极其基本的环境是有限的.

研究的目的:

  • 从理论上研究HMPA中的酸指标的过渡点.
  • 设计新的酸指标,适用于非常基本的HMPA解决方案.
  • 建立HMPA的一般基本性尺度,扩展到已知的分子基础之外.

主要方法:

  • 在六甲基酸中理论研究过渡点.
  • 三个新的酸指标的设计,具有多个过渡点.
  • 开发深色,低核性离子用于指示器设计.

主要成果:

  • 成功设计了三种新的HMPA酸指标.
  • 这些指标具有多个过渡点,并表现出深深的色彩.
  • 为HMPA解决方案建立了一个全面的基本度表.

结论:

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  • 理论研究提供了对HMPA.指标行为的洞察.
  • 设计的指标有效地表征了非常基本的HMPA解决方案.
  • 这项工作扩大了对非水系统基本性尺度的基本理解.