Sodium Chromate(Sodium Chromium Oxide) (Na2CrO4)-Powder

Characteristic

Sodium chromate is the inorganic compound with the formula Na₂CrO₄. It exists as a yellow hygroscopic solid, which can form tetra-, hexa-, and decahydrates. It is an intermediate in the extraction of chromium from its ores.

Chemical formula:Na₂CrO₄

Molar mass: 161.97 g/mol

Appearance: yellow crystals

Odor: odorless

Density: 2.698 g/cm³

Melting point: 792 °C (1,458 °F; 1,065 K) (anhydrous)  20 °C (decahydrate)

Solubility in water:31.8 g/100 mL (0 °C)  84.5 g/100 mL (25 °C)  126.7 g/100 mL (100 °C)

Solubility: slightly soluble in ethanol

Solubility in methanol: 0.344 g/100 mL (25 °C)

Magnetic susceptibility (χ):+55.0·10⁻⁶ cm³/mol

Crystal structure:orthorhombic

Application

Aside from its central role in the production of chromium from its ores, sodium chromate is used as a corrosion inhibitor in the petroleum industry. It is also a dyeing auxiliary in the textile industry. It is a diagnostic pharmaceutical in determining red blood cell volume.

In organic chemistry, sodium chromate is used as an oxidant, converting primary alcohols to carboxylic acids and secondary alcohols to ketones.