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Related Concept Videos

Ions as Acids and Bases02:54

Ions as Acids and Bases

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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:
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Dynamic Electrochemical Measurement of Chloride Ions
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Improved NMR-based diffusion measurements for inorganic ions.

Maria Clara D N G Leal1, Binhan Yu1, Tianzhi Wang1

  • 1Department of Biochemistry & Molecular Biology, Sealy Center for Structural Biology & Molecular Biophysics, University of Texas Medical Branch, 301 University Blvd, Galveston, Texas 77555-1068, USA. j.iwahara@utmb.edu.

The Analyst
|January 28, 2026
PubMed
Summary
This summary is machine-generated.

The bipolar-pair spin-echo method enhances nuclear magnetic resonance (NMR) diffusion measurements for inorganic ions. This technique offers improved sensitivity and precision compared to traditional methods, reducing experiment times.

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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Nuclear magnetic resonance (NMR) diffusion measurements are valuable for studying inorganic ions in chemical research.
  • Standard NMR pulse sequences are suboptimal for inorganic ions due to their quadrupolar nuclei, low gyromagnetic ratios, and rapid relaxation.
  • These properties decrease sensitivity, especially in stimulated-echo sequences requiring longitudinal magnetization storage.

Purpose of the Study:

  • To evaluate the suitability of common NMR diffusion pulse sequences for inorganic ions.
  • To compare the performance of the bipolar-pair (BPP) spin-echo and BPP stimulated-echo methods for inorganic ion diffusion measurements.
  • To identify a more sensitive and robust NMR method for inorganic ion diffusion studies.

Main Methods:

  • Diffusion NMR experiments were conducted using 39K and 25Mg nuclei on DNA solutions.
  • The bipolar-pair (BPP) spin-echo and BPP stimulated-echo pulse sequences were employed.
  • Eddy current suppression and signal-to-noise ratios were assessed for both methods.

Main Results:

  • The BPP spin-echo method demonstrated over a 2-fold increase in sensitivity compared to the BPP stimulated-echo method.
  • Both methods provided consistent diffusion coefficients and effective eddy current suppression.
  • The BPP spin-echo method yielded higher precision due to superior signal-to-noise ratios.

Conclusions:

  • The BPP spin-echo method is a more sensitive and robust technique for diffusion NMR of inorganic ions, especially with strong gradients.
  • This method significantly reduces measurement time (by a factor of 4) compared to the stimulated-echo approach.
  • The findings facilitate broader applications of NMR diffusion measurements in inorganic chemistry and related fields.