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Silver chromate AI simulator
(@Silver chromate_simulator)
Hub AI
Silver chromate AI simulator
(@Silver chromate_simulator)
Silver chromate
Silver chromate is an inorganic compound with formula Ag2CrO4 which appears as distinctively coloured brown-red crystals. The compound is insoluble and its precipitation is indicative of the reaction between soluble chromate and silver precursor salts (commonly potassium/sodium chromate with silver nitrate). This reaction is important for two uses in the laboratory: in analytical chemistry it constitutes the basis for the Mohr method of argentometry, whereas in neuroscience it is used in the Golgi method of staining neurons for microscopy.
In addition to the above, the compound has been tested as a photocatalyst for wastewater treatment. The most important practical and commercial application for silver chromate, however, is its use in Li-Ag2CrO4 batteries, a type of lithium battery mainly found in artificial pacemaker devices.
As for all chromates, which are chromium(VI) species, the compound poses a hazard of toxicity, carcinogenicity and genotoxicity, as well as great environmental harm.
Silver chromate is usually produced by the salt metathesis reaction of potassium chromate (K2CrO4) and silver nitrate (AgNO3) in purified water – the silver chromate will precipitate out of the aqueous reaction mixture:
This occurs as the solubility of silver chromate is very low (Ksp = 1.12×10−12 or 6.5×10−5 mol/L).
The formation of insoluble Ag2CrO4 nanostructures via the above reaction with good control over particle size and shape has been achieved through sonochemistry, template-assisted synthesis or hydrothermal methods.
The compound is polymorphic and can exhibit two crystal structures depending on temperature: hexagonal at higher and orthorhombic at lower temperatures. The hexagonal phase transforms to the orthorhombic upon cooling below the crystal structure transition temperature T=482 °C.
The orthorhombic polymorph is the commonly encountered one and it crystallizes in the space group Pnma, with two distinct coordination environments for the silver ions (one tetragonal bipyramidal and the other distorted tetrahedral).
Silver chromate
Silver chromate is an inorganic compound with formula Ag2CrO4 which appears as distinctively coloured brown-red crystals. The compound is insoluble and its precipitation is indicative of the reaction between soluble chromate and silver precursor salts (commonly potassium/sodium chromate with silver nitrate). This reaction is important for two uses in the laboratory: in analytical chemistry it constitutes the basis for the Mohr method of argentometry, whereas in neuroscience it is used in the Golgi method of staining neurons for microscopy.
In addition to the above, the compound has been tested as a photocatalyst for wastewater treatment. The most important practical and commercial application for silver chromate, however, is its use in Li-Ag2CrO4 batteries, a type of lithium battery mainly found in artificial pacemaker devices.
As for all chromates, which are chromium(VI) species, the compound poses a hazard of toxicity, carcinogenicity and genotoxicity, as well as great environmental harm.
Silver chromate is usually produced by the salt metathesis reaction of potassium chromate (K2CrO4) and silver nitrate (AgNO3) in purified water – the silver chromate will precipitate out of the aqueous reaction mixture:
This occurs as the solubility of silver chromate is very low (Ksp = 1.12×10−12 or 6.5×10−5 mol/L).
The formation of insoluble Ag2CrO4 nanostructures via the above reaction with good control over particle size and shape has been achieved through sonochemistry, template-assisted synthesis or hydrothermal methods.
The compound is polymorphic and can exhibit two crystal structures depending on temperature: hexagonal at higher and orthorhombic at lower temperatures. The hexagonal phase transforms to the orthorhombic upon cooling below the crystal structure transition temperature T=482 °C.
The orthorhombic polymorph is the commonly encountered one and it crystallizes in the space group Pnma, with two distinct coordination environments for the silver ions (one tetragonal bipyramidal and the other distorted tetrahedral).
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