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Description
| Chemical Name | Potassium Dichromate |
| Chemical Grade | CP |
| Chemical Formula | Cr₂K₂O₇ |
| Chemical Weight | 294,18 g/mol |
| CAS No | 7778-50-9 |
| Solubility in Water | ca.29,4 g/l at 20 °C |
| Appearance | Bright Yellowish Red to Orange-Red crystals |
| Melting Point | Melting Point/Range: 398 °C – lit. |
| Assay | min. 99.5% |
| Calcium (Ca) | < 0.005% |
| Chloride (CI) | < 0.005% |
| Sodium (Na) | < 0.05% |
| Sulphate (SO4) | < 0.01% |
| Water Insoluble Matter | < 0.05% |
Key Applications
- Analytical Chemistry: Potassium Dichromate Functions as a primary standard in redox titrations to quantify reducing agents.
- Organic Synthesis: Serves as a selective oxidant that converts secondary alcohols into ketones, and primary alcohols into aldehydes or carboxylic acids.
- Chemical Testing: Acts as a diagnostic reagent to differentiate aldehydes from ketones via a distinct orange-to-green color shift (\(\text{Cr}^{6+} \rightarrow \text{Cr}^{3+}\)).
- Industrial Treatment: Utilized as a raw material for potassium chrome alum, as well as a fixative for leather tanning and wood staining.
- Photography & Printing: Employed historically in early imaging methods like gum bichromate printing and chromium intensification.
- Surface Finishing: Potassium Dichromate is Applied in specialized metal treatments and electroplating to boost corrosion resistance.
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