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Related Concept Videos

Leveling Effect and Non-Aqueous Acid-Base Solutions02:11

Leveling Effect and Non-Aqueous Acid-Base Solutions

This lesson defines the leveling effect in acidic and basic solutions and its role in aqueous and non-aqueous solutions. It is essential to understand the competing nature of various species in a chemical system.
The Leveling Effect of a Solvent
A generic acid (HA) reacts with the generic base (B-) to yield the corresponding conjugate base (A-) and conjugate acid (HB):
Ions as Acids and Bases02:54

Ions as Acids and Bases

Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Weak Acid Solutions04:02

Weak Acid Solutions

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Interfacial Electrochemical Methods: Overview01:06

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Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Water: A Bronsted-Lowry Acid and Base02:30

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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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Related Experiment Video

Updated: Jul 2, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Interfacial structures of acidic and basic aqueous solutions.

Chuanshan Tian1, Na Ji, Glenn A Waychunas

  • 1Department of Physics, University of California, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|September 9, 2008
PubMed
Summary
This summary is machine-generated.

Hydronium and iodide ions accumulate at water interfaces, influencing water molecule orientation and spectral properties. Hydroxide ions also appear at interfaces, but their structural role remains unclear.

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Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
10:28

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Related Experiment Videos

Last Updated: Jul 2, 2026

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
09:43

Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy

Published on: August 13, 2019

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
10:28

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Understanding the structure and dynamics of aqueous interfaces is crucial for various chemical and biological processes.
  • The behavior of ions at the water/vapor interface significantly impacts interfacial properties.

Purpose of the Study:

  • To investigate the interfacial behavior of hydronium (H3O+), iodide (I-), and hydroxide (OH-) ions at aqueous solution/vapor interfaces.
  • To characterize the orientation of water molecules at these interfaces using phase-sensitive sum-frequency vibrational spectroscopy (SFVS).

Main Methods:

  • Phase-sensitive sum-frequency vibrational spectroscopy (SFVS) was employed to study the water/vapor interfaces of HCl, HI, and NaOH solutions.
  • Analysis of the imaginary part of surface spectral responses provided insights into OH stretch vibrations and net polar orientations of water species.

Main Results:

  • Hydronium ions were observed to preferentially accumulate at the interface, with their OH stretches contributing to the "ice-like" spectral band.
  • The positive surface field created by hydronium ions reorients interfacial water, enhancing the "liquid-like" spectral band.
  • Iodide ions also accumulate at the interface, forming a double-charge layer with hydronium ions and modifying the surface field.
  • Hydroxide ions were found to be in excess at the interface in NaOH solutions, indicated by spectral changes, though their structural integration is unclear.

Conclusions:

  • The study provides direct evidence for the interfacial accumulation of hydronium and iodide ions, detailing their impact on interfacial water structure and orientation.
  • The findings highlight the distinct roles of different ions in shaping the water/vapor interface.
  • Further research is needed to elucidate the precise structural incorporation of hydroxide ions at the aqueous interface.