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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...

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Metronidazolium perchlorate.

Yong-Tao Wang1, Xiao-Lei Chu, Shi-Chen Yan

  • 1Shandong Provincial Key Laboratory of Fine Chemicals, Department of Chemical Engineering, Shandong Institute of Light Industry, Jinan, Shandong 250353, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|May 19, 2011
PubMed
Summary
This summary is machine-generated.

This study details the crystal structure of 1-(2-hydroxy-ethyl)-2-methyl-5-nitro-1H-imidazol-3-ium perchlorate. The compound features zigzag chains formed by intermolecular hydrogen bonds between cations.

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Area of Science:

  • Crystallography
  • Materials Science
  • Organic Chemistry

Background:

  • Understanding the crystal structure of organic salts is crucial for predicting their physical and chemical properties.
  • Nitroimidazole derivatives are of interest due to their diverse applications.

Purpose of the Study:

  • To elucidate the crystal structure of 1-(2-hydroxy-ethyl)-2-methyl-5-nitro-1H-imidazol-3-ium perchlorate.
  • To identify and analyze the intermolecular and intramolecular interactions within the crystal lattice.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the crystal structure.
  • Analysis of hydrogen bonding networks (N-H⋯O, O-H⋯O, C-H⋯O) was performed.

Main Results:

  • The crystal structure reveals cations linked by intermolecular N-H⋯O hydrogen bonds, forming zigzag chains along the c axis.
  • Cations and anions are interconnected via O-H⋯O and C-H⋯O hydrogen bonds.
  • A weak intramolecular C-H⋯O hydrogen bond was also identified.

Conclusions:

  • The hydrogen bonding network significantly influences the packing and stability of the crystal structure.
  • The detailed structural information provides a basis for further studies on the properties and potential applications of this nitroimidazole derivative.