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Silver is a non-ferrous metal that has the highest electrical and thermal conductivity of all the metals. It is stable in air and water but tarnishes with ozone, hydrogen sulfide or air containing sulfur.

Its atomic mass is 431.8 grams per mole (using 4 significant digits). The formula is Ag2Cr2O7 where Ag represents silver and Cr corresponds to chromium. The anion has a charge of -2.

The oxidation of benzylic and allylic alcohols is catalyzed by the addition of tetrakis(pyridine)silver dichromate to refluxing benzene under aqueous conditions. The reagent shows a very high yield of oxidation and is therefore highly efficient in the synthesis of cyclic alkenes from carbonyl compounds.

Precipitation Reactions

Silver chromate is obtained through a precipitation reaction between a solution of silver nitrate (AgNO3) and potassium chromate (K2CrO4), resulting in an insoluble product, the reddish-orange silver dichromate. This type of exchange reaction is called a precipitation reaction, because it produces an insoluble product that can’t be easily separated from the nitrate solution.

Sonochemical Production of Nanostructures

A sonochemical method has been used to prepare Ag2CrO4 and Ag2CrO7 nanoparticles using silver salicylate as precursor. The effects of sonication time, type of surfactant and concentration were investigated on the morphology and particle size of the nanostructures. The as-prepared products were characterized by techniques like powder X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy.

Unlike the test with a drop of reagent, this one is slightly invasive and removes a thin layer of silver on a hidden part of the object. Nevertheless, it does not harm the item and it allows you to detect whether an object is solid silver or not.