Chromic acid

The chromic acid is a Diacide. It is a Oxacide of formula H ₂ Cr O ₄ By the loss of two protons (H⁺) it forms the chromate ion.

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Description

The chromic acid and its salts called chromates are compounds of chromium to the state of oxidation +6. They thus have properties of oxidants very much used in organic chemistry for example oxidation of the Aniline in Quinone. The mixture Na₂Cr₂O₇, dichromate of sodium is an example of made up used.

The yellow chromate ion of color tends to dimériser in aqueous solution to be formed the ion dichromate of Cr₂O₇^2- formula of orange color and under certain condition one obtains a polymerization and the production of polychromates of Cr_nO_3n+1^2- formula of red color.

Synthesis of the acid

The synthesis is done by chromium III oxidation chromium plates VI of them which can give according to the conditions a chromate ion the acid or the CrO₃.On oxide can notice that one finds chromates in nature as chromate PbCrO₄ the lead.

Use

The acid even is used little him but one makes use of chromates like oxidant powerful and easy to use in organic chemistry. The chromate ion can be also used to precipitate certain ions in aqueous solution in analytical chemistry.

Toxicity

The chromate ion is famous toxic being contrary to derived from chromium III and it is necessary to take special precautions to use chromates.

Notes and references of the article

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