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Related Concept Videos

Qualitative Analysis03:46

Qualitative Analysis

23.6K
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.
For instance, group IV...
23.6K
Factors Affecting Solubility04:01

Factors Affecting Solubility

36.6K
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 Chȃtelier’s principle. Consider the dissolution of silver iodide:
36.6K
Common Ion Effect03:24

Common Ion Effect

45.8K
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:
45.8K
Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

4.0K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
4.0K
Titration of Polyprotic Base with a Strong Acid01:18

Titration of Polyprotic Base with a Strong Acid

4.5K
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...
4.5K
Alkali Metals03:06

Alkali Metals

24.2K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
24.2K

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Mineral Speciation for CO2 Captured by Potassium Hydroxide.

Ehsan Ezzatpour Ghadim1, Stephanie Bachmann2, Rodrigo S Correa3,4

  • 1School of Engineering, University of Warwick, Coventry, CV4 7AL, UK.

Chemistryopen
|October 14, 2025
PubMed
Summary

Greenhouse gas capture using potassium hydroxide (KOH) produces valuable minerals. Multimodal analysis reveals KHCO3 and K2CO3 mixtures, with high-purity KHCO3 from aqueous-ethanol solutions, advancing CO2 utilization strategies.

Keywords:
Carbon dioxide captureHigh field 1H, 13C, and 39K NMRPotassium bicarbonate and carbonatePowder X‐ray diffractionSingle‐crystal X‐ray diffraction

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Area of Science:

  • Materials Science
  • Chemistry
  • Environmental Science

Background:

  • Greenhouse gas capture, particularly CO2, is crucial for mitigating global warming.
  • Mineral products from CO2 capture can serve as industrial feedstock.
  • Potassium hydroxide (KOH) is explored as a capture agent in various solvent systems.

Purpose of the Study:

  • To investigate the mineral products formed by atmospheric CO2 capture using KOH.
  • To analyze the composition and speciation of these mineral products across different solvent conditions.
  • To apply advanced analytical techniques for detailed characterization.

Main Methods:

  • Multimodal analysis combining single-crystal X-ray diffraction (SCXRD) and powder X-ray diffraction (PXRD) with Pawley and Rietveld refinements.
  • High-field nuclear magnetic resonance (NMR) spectroscopy (1H, 13C, 39K), including 2D NOESY and ultrahigh-field 39K NMR.
  • Study of reactions in aqueous, aqueous-ethanol, and aqueous-acetone solutions, including solid CO2 enrichment.

Main Results:

  • Potassium bicarbonate (KHCO3) was identified as a product in all reaction systems via SCXRD.
  • PXRD and NMR data indicated mixtures of crystalline and amorphous phases, primarily KHCO3 and potassium carbonate (K2CO3) and its hydrates.
  • Aqueous-ethanol solutions yielded high-purity KHCO3, while other systems showed minor KOH presence.

Conclusions:

  • The study elucidates the speciation of potassium minerals formed during CO2 capture.
  • A multimodal analytical approach provides comprehensive insights into product composition.
  • Optimized solvent conditions, like aqueous-ethanol, can enhance the purity of valuable mineral products like KHCO3.