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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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Acids, Bases and Neutralization Reactions03:26

Acids, Bases and Neutralization Reactions

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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.
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Acids, Bases and Neutralization Reactions01:27

Acids, Bases and Neutralization Reactions

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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...
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Chemical Reactions in Aqueous Solutions03:03

Chemical Reactions in Aqueous Solutions

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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.
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Related Experiment Video

Updated: Nov 11, 2025

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures
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Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures

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The Chlorate-Nitrous Acid-Iodine-Iodide Oscillating Reaction.

Emily V Monteiro1, João P R Queiroz1, Roberto B Faria1

  • 1Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909 RJ, Brazil.

ACS Omega
|March 29, 2021
PubMed
Summary
This summary is machine-generated.

A novel oscillating reaction using chlorate and nitrous acid was discovered. This reaction, observed in a continuous stirred-tank reactor (CSTR), exhibits fast oscillations and bursts, potentially simulating biological signals.

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Area of Science:

  • Chemical Kinetics
  • Nonlinear Dynamics
  • Reaction-Diffusion Systems

Background:

  • Oscillating chemical reactions are crucial for understanding complex dynamic systems.
  • Previous oscillating reactions have not utilized nitrous acid or demonstrated such rapid dynamics.

Purpose of the Study:

  • To introduce a new oscillating reaction system.
  • To characterize the behavior of this novel reaction.
  • To explore its potential applications in simulating fast biological processes.

Main Methods:

  • Observation of a chlorate-based oscillating reaction.
  • Experimentation in a continuous stirred-tank reactor (CSTR).
  • Analysis of reaction dynamics at room temperature.

Main Results:

  • Discovery of a new oscillating reaction family initiated by chlorate.
  • Identification of nitrous acid as a key reactant.
  • Observation of four distinct dynamic behaviors: simple oscillations, mixed mode oscillations, bursts, and quasiperiodicity.
  • Characterization of very short oscillation periods (around 1 second) and fast bursts.

Conclusions:

  • This work establishes a new class of oscillating reactions.
  • The observed fast dynamics and bursts suggest potential for modeling rapid biological events, such as neural signaling.