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Aluminium chromate

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08048036175

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Hyderabad, India, 500001

Description

Aluminium chromate is an inorganic compound with the chemical formula Al 2 ( CrO 4 ) 3 Al 2 (CrO 4 ) 3 . It consists of aluminium cations and chromate anions, forming a ternary ionic compound with distinct yellow color due to the chromate group.​​ Chemical Properties and Structure Formula: Al 2 ( CrO 4 ) 3 Al 2 (CrO 4 ) 3 .​​ Molecular Weight: 401.94 g/mol.​ Structure: Each formula unit contains two aluminium ions ( Al 3 + Al 3+ ) and three chromate ions ( CrO 4 2 − CrO 4 2− ), with aluminium in a +3 oxidation state, chromium in a +6 oxidation state, and the chromate ion arranged tetrahedrally around the chromium.​​ Physical Properties Appearance: Generally appears as a yellow solid or powder, typical of chromate salts.​​ Solubility: Chromate salts are typically soluble in water, producing yellow solutions.​ Density & State: Not commonly available as a commercial reagent due to limited industrial applications, but calculated density is roughly 401.94 g/mol.​ Uses Pigments and Coatings: Chromate compounds (including aluminium chromate) may be used as pigments or corrosion inhibitors in paints or coatings, though more common chromates include zinc and potassium chromate.​ Analytical Chemistry: Sometimes used in qualitative inorganic analysis as a source of chromate ions.​ Research: Studied for its crystal structure and chromate-dichromate equilibria in materials science.​ Safety Note Chromate salts are toxic due to the hexavalent chromium ( Cr 6 + Cr 6+ ), associated with carcinogenic and oxidative hazards.​ Handling requires protective equipment and disposal precautions compliant with environmental and health regulations.​ Aluminium chromate is distinguishable by its chemical formula and characteristic yellow color, used mostly for analytical, research, or specialized pigment purposes.​​

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