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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:
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Increased Acid Dissociation at the Quartz/Water Interface.

Shivam Parashar1, Dominika Lesnicki2, Marialore Sulpizi2

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Area of Science:

  • Surface Chemistry
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Acids typically exhibit reduced acidity at water surfaces.
  • The behavior of acid-base chemistry at solid/liquid interfaces is less understood.

Purpose of the Study:

  • To investigate the acidity of pyruvic acid at the quartz/water interface.
  • To understand the factors influencing acid-base equilibria at solid/liquid interfaces.

Main Methods:

  • Free energy perturbation calculations.
  • Electronic structure-based molecular dynamics simulations.

Main Results:

  • Pyruvic acid acidity increased by nearly two units at the quartz/water interface.
  • Specific microsolvation and stabilization of the deprotonated form by surface silanols and interfacial water contribute to increased acidity.

Conclusions:

  • The solid/liquid interface can enhance acid strength, contrary to observations at liquid/vapor interfaces.
  • Surface interactions significantly alter molecular properties like acidity.