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Related Concept Videos

Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
Acid/Base Strengths and Dissociation Constants03:02

Acid/Base Strengths and Dissociation Constants

The relative strength of an acid or base is the extent to which it ionizes when dissolved in water. If the ionization reaction is essentially complete, the acid or base is termed strong; if relatively little ionization occurs, the acid or base is weak. There are many more weak acids and bases than strong ones. The most common strong acids and bases are listed below:
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Weak Acid Solutions04:02

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...
Acid Strength and Molecular Structure03:05

Acid Strength and Molecular Structure

Binary Acids and Bases
In the absence of any leveling effect, the acid strength of binary compounds of hydrogen with nonmetals (A) increases as the H-A bond strength decreases down a group in the periodic table. For group 17, the order of increasing acidity is HF < HCl < HBr < HI. Likewise, for group 16, the order of increasing acid strength is H2O < H2S < H2Se < H2Te. Across a row in the periodic table, the acid strength of binary hydrogen compounds increases with increasing...

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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction
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A Method to Manipulate Surface Tension of a Liquid Metal via Surface Oxidation and Reduction

Published on: January 26, 2016

Surface tensions and surface potentials of acid solutions.

Alexandre P dos Santos1, Yan Levin

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970 Porto Alegre, Rio Grande do Sul, Brazil.

The Journal of Chemical Physics
|October 26, 2010
PubMed
Summary

A new theory quantitatively calculates excess surface tension in acid solutions. It reveals strong adsorption of hydronium ions (H+) at the solution-air interface, explaining observed electrostatic potential differences.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Electrochemistry

Background:

  • Surface tension is a critical property of liquid solutions, particularly for acids.
  • Understanding the behavior of ions at the air-solution interface is key to explaining solution properties.
  • Previous models lacked quantitative accuracy for excess surface tension in acid solutions.

Purpose of the Study:

  • To develop a quantitative theory for calculating the excess surface tension of acid solutions.
  • To investigate the adsorption behavior of hydronium ions (H+) at the solution-air interface.
  • To explain the experimentally measured electrostatic potential difference across the air-water interface.

Main Methods:

  • Development of a theoretical framework to model ion adsorption and surface tension.
  • Quantitative calculation of excess surface tension based on the proposed theory.
  • Qualitative analysis of electrostatic potential difference using the theoretical model.

Main Results:

  • The presented theory quantitatively predicts the excess surface tension of acid solutions.
  • Hydronium ions (H+) are found to be strongly adsorbed at the solution-air interface.
  • A specific orientation of hydronium ions (hydrogens pointing into the bulk water) is necessary to match experimental electrostatic potential data.

Conclusions:

  • The developed theory provides accurate quantitative predictions for excess surface tension in acid solutions.
  • The strong adsorption and specific orientation of hydronium ions are crucial factors governing the air-water interface properties.
  • The theory offers a valuable tool for understanding and predicting the behavior of acid solutions at interfaces.