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Leveling Effect01:29

Leveling Effect

In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...
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...
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.
Ladder Diagrams: Acid–Base Equilibria01:32

Ladder Diagrams: Acid–Base Equilibria

Understanding the chemistry between the reagents is necessary for performing any experiment. To this end, scientists have designed a tool called a ladder diagram, which is a graphical representation that helps illustrate the chemistry of a system.
A ladder diagram for acid-base equilibria consists of a vertical axis that represents pH and horizontal bars (steps on the ladder) that help position all the pKa values in the system. At equilibrium, the pH value of the system corresponds to one of...
Position of Equilibrium in Acid-Base Reactions02:05

Position of Equilibrium in Acid-Base Reactions

In any solution, the value of pKa indicates whether an acid is completely dissociated or not. A negative pKa corresponds to a stronger acid, whereas a positive pKa corresponds to a weaker acid. Consider the reaction between ammonia and an ethoxide ion. In this reaction, ethanol with a pKa of 15.9 is a stronger acid than ammonia with a pKa of 38. Recall that the strong acid forms a weak conjugate base, and a weak acid forms a strong conjugate base. Hence, the ethoxide ion is a weak base.
Bronsted-Lowry Acids and Bases02:58

Bronsted-Lowry Acids and Bases

The acid-base reaction class has been studied for quite some time. In 1680, Robert Boyle reported traits of acid solutions that included their ability to dissolve many substances, to change the colors of certain natural dyes, and to lose these traits after coming in contact with alkali (base) solutions. In the eighteenth century, it was recognized that acids have a sour taste, react with limestone to liberate a gaseous substance (now known to be CO2), and interact with alkalis to form neutral...

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Video Experimental Relacionado

Updated: Jun 28, 2026

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer

Published on: April 19, 2021

Reacciones ácido-base atascadas en las interfaces.

Julianne M Gibbs-Davis1, Jennifer J Kruk, Christopher T Konek

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA.

Journal of the American Chemical Society
|November 14, 2008
PubMed
Resumen
Este resumen es generado por máquina.

La química ácido-base interfacial rastrea el pH de la masa en bajos niveles de sal. En concentraciones de sal más altas, la química se retrasa durante horas, luego ocurre rápidamente, mostrando histeresis y procesos a granel rezagados.

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Área de la Ciencia:

  • Química Física es la química física.
  • Ciencias de la superficie Ciencias de la superficie.
  • La óptica no lineal es la óptica no lineal.

Sus antecedentes:

  • La química ácido-base es crucial para muchos procesos interfaciales.
  • Comprender la dinámica del pH interfacial es esencial para campos como la electroquímica y la ciencia de los materiales.
  • Las técnicas ópticas no lineales ofrecen sensores sensibles de los fenómenos interfaciales.

Objetivo del estudio:

  • Para investigar la influencia de la concentración de sal en las reacciones ácido-base en las interfaces acuosa/sólida.
  • Determinar la cinética y los mecanismos que rigen la química ácido-base interfacial bajo diferentes intensidades iónicas.
  • Para explorar el fenómeno de la histeresis en las titulaciones ácido-base interfaciales.

Principales métodos:

  • Utilizó óptica no lineal para monitorear las reacciones ácido-base interfaciales en tiempo real.
  • Se variaron sistemáticamente las concentraciones de sal de halogenuros alcalinos (10-100 mM) en soluciones acuosas.
  • Tiempos y tasas de retraso de reacción analizados en función del tipo y concentración de sal.

Principales resultados:

  • La química ácido-base interfacial rastreó con precisión el pH a granel en bajas concentraciones de sal.
  • Se observaron retrasos significativos (horas) en las reacciones interfaciales a 10-100 mM de sal.
  • Las velocidades de reacción siguieron el efecto cinético de la sal, con tiempos de retraso correlacionados con la polarizabilidad aniónica y la hidratación catiónica.
  • Se observó una histeresis masiva en las titulaciones ácido-base interfaciales.
  • Los sistemas interfaciales exhibieron retrasos espaciales y temporales en comparación con la química ácido-base a granel cuando la longitud de Debye se acercó a 1 nm.

Conclusiones:

  • La concentración de sal altera dramáticamente la cinética de la química ácido-base interfacial.
  • Los retrasos e histeresis observados se atribuyen a las interacciones iónicas que influyen en la capa interfacial.
  • El pH interfacial puede quedarse significativamente por detrás del pH a granel en sistemas con longitudes de Debye cercanas a 1 nm, lo que afecta a los procesos sensibles al ciclo del pH.