Chromite is used as a refractory in the production of steel, copper, glass and cement. Chromite occurs as a primary accessory mineral in basic and ultrabasic igneous rocks.
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Sodium dichromate is the inorganic compound with the formula Na2Cr2O7. Usually, however, the salt is handled as its dihydrate Na2Cr2O7·2H2O. Virtually all chromium ore is processed via conversion to sodium dichromate and virtually all compounds and materials based on chromium are prepared from this salt. In terms of reactivity and appearance, sodium dichromate and potassium dichromate are very similar. The sodium salt is, however, around twenty times more soluble in water than the potassium salt (49 g/L at 0 °C) and its equivalent weight is also lower, which is often desirable.[2]
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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. Sodium chromate, like other hexavalent chromium compounds, is toxic and Carcinogenic. [uses] 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 and a wood preservative. 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. Properties Chemical formula, na2cro4 Molar mass, 161.97 g/mol Appearance, yellow crystals Odor, odorless Density, 2.698 g/cm3 Melting point, 792 c (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)
