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Weak Base Solutions

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...

Weak Acid Solutions

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...

Titration of a Weak Acid with a Weak Base

Titration of a Weak Acid with a Weak Base

Weak acids and bases do not undergo dissociation completely, and titrations between these two are rarely studied. When such studies are performed, say, for the titration of a weak acid with a weak base, the titration curve plots the change in pH as a function of the volume of base added. Take the titration of acetic acid with ammonia, for instance. During the titration, these two species form ammonium acetate and water, but the pH change is slow and gradual.
As a result, there is no simple...

Titration Calculations: Weak Acid - Strong Base

Titration Calculations: Weak Acid - Strong Base

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:

Titration of a Weak Acid with a Strong Base

Titration of a Weak Acid with a Strong Base

In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...

Titration of a Weak Base with a Strong Acid

Titration of a Weak Base with a Strong Acid

The titration curve of a weak base like ammonia with a strong acid like hydrochloric acid is the mirror image of the titration curve of a weak acid with a strong base.
Using the ICE table and substituting the Kb value, we calculate the initial pH of 50 mL of 0.1 M ammonia to be 11.11. Addition of 25 mL of 0.1 M hydrochloric acid to this solution of ammonia results in a buffer with an equal concentration of ammonia and ammonium ions. The pH of this buffer can be calculated by substituting these...

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Related Experiment Video

Updated: Jan 22, 2026

Fragmenting Bulk Hydrogels and Processing into Granular Hydrogels for Biomedical Applications

Fragmenting Bulk Hydrogels and Processing into Granular Hydrogels for Biomedical Applications

Published on: May 17, 2022

Stress Isotropization in Weakly Jammed Granular Packings.

Félix Benoist^1,2, Mehdi Bouzid³, Martin Lenz^1,4

¹LPTMS, CNRS, Université Paris-Saclay, 91400, Orsay, France.

Physical Review Letters

|January 20, 2026

Summary

This summary is machine-generated.

Nonlinearities in granular media isotropize stress propagation near the unjamming transition. This finding challenges existing models of yielding and plastic events in amorphous materials.

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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Published on: September 26, 2016

Area of Science:

Physics
Materials Science
Geophysics

Background:

Granular media exhibit localized plastic events (shear transformations) under shear, creating anisotropic stresses.
Under high confining pressure, stress propagation is linear and quadrupolar.
Nonlinear effects near the unjamming transition are poorly understood.

Purpose of the Study:

Investigate the impact of nonlinearities on stress propagation in granular media.
Understand how these nonlinearities affect plastic events and yielding transitions.

Main Methods:

Granular dynamics simulations were employed.
Comparison with a previously developed continuum elastic model.

Main Results:

Nonlinearities lead to an isotropization of propagated stresses.
Simulations align with predictions from continuum elastic models.
This isotropization contrasts with the quadrupolar stress propagation observed under strong confinement.

Conclusions:

The study reveals a significant shift in stress propagation behavior due to nonlinearities as granular media approach the unjamming transition.
This isotropization phenomenon could fundamentally alter the understanding of yielding transitions in weakly jammed amorphous materials.
The findings necessitate a re-evaluation of models conceptualizing yielding as avalanches of plastic events.