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Buffers

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...

Buffers: Overview

Buffers: Overview

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).

Buffer Effectiveness

Buffer Effectiveness

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...

Molecular Models

Molecular Models

Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.

Complexometric Titration: Ligands

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

EDTA: Chemistry and Properties

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...

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Related Experiment Video

Updated: Feb 18, 2026

Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Model-driven engineering of supramolecular buffering by multivalency.

Tim F E Paffen^1,2, Abraham J P Teunissen^1,2, Tom F A de Greef^3,4

¹Institute for Complex Molecular Systems, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America

|November 22, 2017

Summary

This summary is machine-generated.

This study introduces molecular buffering using ring-chain equilibria. Even-valent molecules, particularly tetravalent ones, demonstrate superior buffering capabilities, validated by experimental data.

Keywords:

molecular buffering multivalency ring–chain equilibria supramolecular

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Published on: February 15, 2016

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Area of Science:

Supramolecular Chemistry
Chemical Engineering
Materials Science

Background:

Molecular buffering systems are crucial for maintaining stable concentrations of molecules.
Previous work focused on divalent monomers for molecular buffering.
A need exists for improved molecular buffering strategies with enhanced stability and control.

Purpose of the Study:

To develop a model-driven engineering approach for enhancing molecular buffering.
To investigate the use of multivalent ring-chain systems for improved buffering.
To explore the impact of monomer valency on buffering efficiency.

Main Methods:

Theoretical modeling of ring-chain equilibria involving multivalent monomers and monovalent end-cappers.
Analysis of an odd-even effect in buffering capabilities based on monomer valency.
Experimental validation using proton nuclear magnetic resonance (¹H NMR) spectroscopy.

Main Results:

Theoretical models predict an odd-even effect, with even-valent molecules exhibiting superior buffering.
Tetravalent molecules show significantly improved supramolecular buffering compared to divalent ones due to statistical ring formation.
Experimental ¹H NMR data validate the model predictions regarding enhanced buffering.

Conclusions:

Model-driven engineering effectively enhances molecular buffering in supramolecular systems.
Multivalent ring-chain systems offer a promising route to precise control over molecular concentrations.
This approach holds considerable potential for applications in supramolecular chemistry and beyond.