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Buffer Effectiveness02:19

Buffer Effectiveness

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Buffer solutions do not have an unlimited capacity to keep the pH relatively constant . Instead, the ability of a buffer solution to resist changes in pH relies on the presence of appreciable amounts of its conjugate weak acid-base pair. When enough strong acid or base is added to substantially lower the concentration of either member of the buffer pair, the buffering action within the solution is compromised.
The buffer capacity is the amount of acid or base that can be added to a given volume...
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Buffers02:56

Buffers

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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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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Buffers: Overview01:30

Buffers: Overview

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Buffers play a crucial role in stabilizing the pH of a solution by mitigating the effects of small amounts of added acid or base. They consist of a weak acid and its conjugate base or a weak base and its conjugate acid. 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 (aq).
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Formation of Complex Ions03:45

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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Supramolecular buffering by ring-chain competition.

Tim F E Paffen1, Gianfranco Ercolani, Tom F A de Greef

  • 1Institute for Complex Molecular Systems, ‡Laboratory of Macromolecular and Organic Chemistry, and §Computational Biology, Eindhoven University of Technology , P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Journal of the American Chemical Society
|January 13, 2015
PubMed
Summary
This summary is machine-generated.

This study reveals supramolecular buffering, where molecules act as chain stoppers in ring-chain equilibria, enabling concentration-independent catalytic activity. This mechanism enhances catalyst robustness and broadens operating concentration ranges.

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Area of Science:

  • Supramolecular Chemistry
  • Catalysis
  • Physical Chemistry

Background:

  • Organocatalytic systems can achieve concentration-independent activity through supramolecular interactions.
  • Supramolecular buffering stabilizes molecular catalysts, enhancing their robustness.

Purpose of the Study:

  • To elucidate the design principles of supramolecular buffering via ring-chain competition.
  • To investigate the influence of thermodynamic parameters on this buffering mechanism.
  • To compare supramolecular buffering with traditional pH buffering and molecular titration.

Main Methods:

  • Combined experimental and theoretical approaches were employed.
  • Analysis of supramolecular ring-chain equilibria.
  • Measurement of equilibrium constants and thermodynamic parameters.

Main Results:

  • Supramolecular buffering occurs when molecules act as chain stoppers in ring-chain equilibria.
  • Effective molarity is key to optimizing the buffering concentration range and maximum buffered molecule concentration.
  • Model predictions align with experimental data across various molecular systems.

Conclusions:

  • Supramolecular buffering offers a novel mechanism for achieving concentration-independent catalysis.
  • Understanding ring-chain equilibria is crucial for designing robust catalytic systems.
  • This work provides a comparative perspective on different buffering strategies.