Potassium dichromate
- CAS number
- 7778-50-9
- Molecular weight
- 294.18
- Molecular formula / chemical symbol
- Cr2K2O7
Description
Orange red luster crystal grain or powder. Bitter taste. No moisture absorption or deliquescence (different from sodium dichromate). Strong heat about 500 ℃ when decomposition for chrome oxide and potassium chromate. In hydrochloric acid when cold don‘t work, the hot happened chlorine gas. Soluble in cold water or 1.25 ten copies of a hot water, not soluble in ethanol aqueous solution, the acid reaction. Relative density 2.676. Melting point 398 ℃ (into brown liquid). Have strong oxidizing, and organic friction or impact can cause burning. Toxic, minimal lethal dose (rabbit, subcutaneous) 10 mg/kg.USES
For system chrome alum. Match, chromium pigment, and for tanning, electroplating, organic synthesis, etc. Determination of sodium thiosulfate solution as the standard of reference. Drop analysis set chloride. Antioxidant. Chromatographic analysis reagent. Organic synthesis. Determination of liver function HuangDan index. Inspection feces, etc.
Keywords:Surface treatment chemicals
Report
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Product name |
Potassium dichromate |
CAS:7778-50-9 |
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Appearance |
Orange red luster crystal grain or powder |
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Chemical formula |
K2Cr2O7 |
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Test items |
Test results |
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analytically pure(AR) |
chemically pure(CP) |
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content（K2Cr2O7),% ≥ |
99.8 |
99.5 |
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Loss on drying，% |
0.05 |
-- |
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(Cl),% |
0.002 |
0.005 |
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(SO4),% |
0.01 |
0.02 |
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(Na),% |
0.05 |
0.1 |
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water insoluble% ≤ |
0.005 |
0.01 |
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(Ca),% |
0.002 |
0.01 |
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(Fe),% |
0.002 |
0.005 |
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(Pb),% |
-- |
-- |
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(Cu),% |
-- |
-- |
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