Aluminium chromate
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.
Specifications
| Model No. | N-CH1162 |
|---|