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Precipitation Titration: Endpoint Detection Methods

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.
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Updated: Jun 1, 2026

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

Published on: September 9, 2016

Guanidinium chloro-chromate.

Hoong-Kun Fun, Jia Hao Goh, Arnab Kar

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

Crystallographic mirror symmetry was observed in guanidinium chloridotrioxidochromate(VI). This study details the crystal structure, revealing delocalization in the guanidinium cation and hydrogen bonding that forms infinite chains.

Area of Science:

Inorganic Chemistry
Crystallography
Solid-State Chemistry

Background:

Guanidinium salts are widely studied for their unique structural and chemical properties.
Chromium(VI) compounds exhibit diverse coordination chemistries and oxidation states.
Understanding crystal structures provides insights into bonding and intermolecular interactions.

Purpose of the Study:

To elucidate the crystal structure of guanidinium chloridotrioxidochromate(VI).
To investigate the symmetry elements and bonding characteristics within the compound.
To analyze the intermolecular interactions and their role in crystal packing.

Main Methods:

Single-crystal X-ray diffraction analysis.
Bond length and angle measurements.

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Last Updated: Jun 1, 2026

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

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Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

Published on: April 27, 2017

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

Analysis of intermolecular hydrogen bonding and symmetry operations.

Main Results:

The guanidinium cation and chloridotrioxidochromate(VI) anion exhibit crystallographic mirror symmetry.
Intermediate C-N bond lengths in the guanidinium cation indicate significant electron delocalization.
Intermolecular N-H⋯Cl interactions form R(2)(1)(6) ring motifs, further linked by N-H⋯O hydrogen bonds into infinite chains along the [010] direction.

Conclusions:

The crystal structure of guanidinium chloridotrioxidochromate(VI) is characterized by symmetry and extensive hydrogen bonding.
Delocalization within the guanidinium cation influences its structural parameters.
The observed hydrogen bonding network dictates the formation of extended chain structures in the solid state.