Sodium Dichromate is an orange to red colored, crystalline, inorganic compound that emits toxic chromium fumes upon heating. Sodium dichromate is highly corrosive and is a strong oxidizing agent. This substance is mainly used to produce other chromium compounds, but is also used in drilling muds, in metal treatments, in wood preservatives, in the production of dyes and organic chemicals and as a corrosion inhibitor.
A powerful oxidizer and a source for chromium-based derivatives is sodium dichromate. Applications for it include pigments and coatings, screen printing in photographic engraving, electroplating, pyrotechnics, and explosives. It is utilized in metal passivation.
Sodium dichromate functions as a corrosion inhibitor in metal treatment and as a wood preservative, shielding wood from termites and fungi. In pigment preparations like lead chromate and chrome oxide green, it is also utilized.
S.No. | Description | Specifications |
---|---|---|
1 | Apperarance | Bright Orange Crystals |
2 | Chemical formula | Na Cr2 O7 2H2 O |
3 | Molecular Weight | 298.0 |
4 | Solubility | Readily soluble in water |
5 | Specific Gravity at 20C | 2.35 |
6 | Heat of Solution cal /gm | Minus 28.2 |
7 | Stability in Air | Deliquescent |
S.No. | Description | Units | Typical Values |
---|---|---|---|
1 | Sodium Bichromate as Na Cr2 O7 2H2 O (%) | % w/w | 99.50 ± 0.1 |
2 | pH of (10% Solution) | 3.8 – 4.2 | |
3 | Matter insoluble in water | % w/w | 0.02 – 0.05 |
4 | Sulphate as SO4 (%) | % w/w | 0.10 – 0.17 |
5 | Chlorides as Cl (%) | % w/w | 0.10 Max |
6 | lron as Fe (%) | % w/w | 0.001 to 0.002 |
7 | Moisture at 105 ° C | % w/w | 11.00 – 11.50 |
Furthermore, sodium dichromate is also extensively utilized in the manufacturing of photovoltaic cells and solar panels, which is estimated to create opportunities for global market growth. Sodium dichromate (Na2Cr2O7) is a potent oxidizing agent commonly used in various industrial applications.