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Strong Acid and Base Solutions03:22

Strong Acid and Base Solutions

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.
Weak Base Solutions03:21

Weak Base Solutions

Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
Polyprotic Acids03:38

Polyprotic Acids

Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
Buffers02:56

Buffers

A solution containing appreciable amounts of a weak conjugate acid-base pair is called a buffer solution, or a buffer. Buffer solutions resist a change in pH when small amounts of a strong acid or a strong base are added. A solution of acetic acid and sodium acetate is an example of a buffer that consists of a weak acid and its salt: CH3COOH (aq) + CH3COONa (aq). An example of a buffer that consists of a weak base and its salt is a solution of ammonia and ammonium chloride: NH3 (aq) + NH4Cl...
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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:
Acid and Bases: Ka, pKa, and Relative Strengths02:35

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This lesson delves into a critical aspect of the relative strengths of acids and bases. The strength of an acid is evaluated by the acid dissociation into its conjugate base and a hydronium ion in water. The complete dissociation of a strong acid is confirmed with a very high concentration of hydronium ions. As a result, an incomplete dissociation process affirms a weak acid. Therefore, the equilibrium is in the forward direction for strong acids and backward for weak acids in these reactions.

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Determination of the Gas-phase Acidities of Oligopeptides
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Estimación de los valores de pKa para los pentaoxifosforanos.

J E Davies1, N L Doltsinis, A J Kirby

  • 1University Chemical Laboratory, Cambridge Uiversity, Cambridge CB2 1EW, United Kingdom.

Journal of the American Chemical Society
|June 6, 2002
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio estima los valores de pKa para los hidroxifosforanos utilizando dos métodos distintos. Los resultados muestran diferencias significativas entre las ionizaciones del grupo hidroxilo apical y ecuatorial, cruciales para la comprensión de la química del fosforano.

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Área de la Ciencia:

  • Química de los organofosforados Química de los organofosforados
  • Química computacional es la química computacional.
  • Química Física es la química física.

Sus antecedentes:

  • Los hidroxifosforanos son intermediarios clave en la química del fósforo.
  • Comprender su comportamiento de ionización (pKa) es esencial para predecir la reactividad.
  • Los métodos existentes para la estimación de pKa en estos sistemas son limitados.

Objetivo del estudio:

  • Para estimar de forma independiente los valores de pKa para los grupos hidroxilo apical y ecuatorial en los hidroxifosforanos.
  • Para comparar la precisión y aplicabilidad de dos métodos computacionales diferentes para la determinación de pKa.
  • Proporcionar datos fiables de pKa para las estructuras representativas de hidroxifosforano.

Principales métodos:

  • Utilizó una correlación de longitud de enlace-pKa derivada de las estructuras cristalinas de los derivados del ciclohexanol.
  • Empleado ab initio cálculos de dinámica molecular para la estimación de pKa.
  • Aplicó ambos métodos a ejemplos específicos de hidroxifosforano: tetraciclohexiloxihidroxifosforano y pentahidroxifosforano.

Principales resultados:

  • El método de longitud de enlace-pKa arrojó valores de pKa de 13.5 ± 1.5 (apical) y 8.62 ± 1.87 (equatorial) para el tetraciclohexiloxihidroxifosforano.
  • Los cálculos iniciales de dinámica molecular proporcionaron valores de pKa de 14.2 (apical) y 9.8 (equatorial) para el pentahidroxifosforano.
  • Ambos métodos indicaron una diferencia significativa en la acidez entre los grupos hidroxilo apicales y ecuatoriales.

Conclusiones:

  • Dos métodos computacionales independientes proporcionan estimaciones de pKa consistentes, aunque ligeramente diferentes, para las ionizaciones de hidroxifosforano.
  • Los hallazgos destacan la importancia de la posición del grupo hidroxilo (apical vs. ecuatorial) en la determinación de la acidez del fosforano.
  • Este trabajo ofrece valiosos datos de pKa para avanzar en el estudio de los compuestos organofosforados.