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The titration of a polyprotic base such as sodium carbonate with a strong acid such as hydrochloric acid results in two equivalence points on the titration curve. At the first equivalence point, the carbonate ions in the base are completely converted to bicarbonate ions. The second equivalence point corresponds to the complete conversion of bicarbonate ions to carbonic acid, which dissociates into carbon dioxide and water. The region before the first equivalence point corresponds to the...
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The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution.  In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
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Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
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An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
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Salt Cluster With Surface Defect Shows Anomalous Acid-Base Chemistry.

Jessica C Hartmann1, Jia Yang Lim2, Yiqi Sheng2

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Summary

The reaction of formic acid with sea-salt aerosols, previously an atmospheric chemistry enigma, is explained by surface defects on sodium chloride clusters. These defects facilitate hydrogen chloride release, reversing typical acid-base behavior.

Keywords:
Density functional theoryIon‐molecule reactionMetadynamicsProton transferSalt cluster

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Area of Science:

  • Atmospheric Chemistry
  • Physical Chemistry
  • Surface Science

Background:

  • The reaction of formic acid with sea-salt aerosols to release hydrogen chloride challenges conventional acid-base principles.
  • This process is crucial for understanding atmospheric chemistry and aerosol behavior.

Purpose of the Study:

  • To elucidate the mechanism behind the acid displacement reaction of formic acid with sea-salt aerosols.
  • To investigate the role of cluster structure and defects in this reaction.

Main Methods:

  • Comparison of formic acid reactivity with Na13Cl12+ and Na14Cl13+ clusters using mass spectrometry under ultra-high vacuum conditions.
  • Quantum chemical calculations to determine reaction energetics.

Main Results:

  • Na14Cl13+ (magic cluster) showed no reaction with formic acid.
  • Na13Cl12+ (defect cluster) readily reacted, releasing hydrogen chloride and incorporating formate.
  • Quantum calculations confirmed the reaction is exothermic for the defect cluster due to formate ion "induced fit" and strong electrostatic interactions.

Conclusions:

  • Surface defects on sea-salt clusters are key to enabling the acid displacement reaction.
  • The "induced fit" of formate ions in defect sites drives the reaction, overcoming gas-phase acidity differences.