Potassium dichromate
- CAS No.
- 7778-50-9
- Chemical Name:
- Potassium dichromate
- Synonyms
- POTASSIUM BICHROMATE;kaliumdichromat;bichromateofpotash;CHROMIUM POWDER;YEAST BOUND CHROMIUM;Potassiumdichromate,99%;ZGSJ;iopezite;CHROMIUM METAL;HTM BROTH 100ML
- CBNumber:
- CB5854318
- Molecular Formula:
- Cr2K2O7
- Molecular Weight:
- 294.1846
- MOL File:
- 7778-50-9.mol
- MSDS File:
- SDS
- Modify Date:
- 2023/4/23 13:52:06
| Melting point | 398 °C (lit.) |
|---|---|
| Boiling point | 82 °C |
| Density | 7.14 g/mL at 25 °C(lit.) |
| Flash point | 50 °F |
| storage temp. | Store at RT. |
| solubility | H2O: 0.1 M at 20 °C, clear, orange |
| form | powder |
| color | Orange-red |
| Specific Gravity | 2.676 |
| PH | 3.5-5.0 (25℃, 0.1M in H2O) |
| Water Solubility | 125 g/L (20 ºC) |
| Merck | 14,7627 |
| Exposure limits |
ACGIH: TWA 0.0002 mg/m3; STEL 0.0005 mg/m3 (Skin) OSHA: Ceiling 0.1 mg/m3 NIOSH: IDLH 15 mg/m3; TWA 0.0002 mg/m3 |
| InChIKey | KMUONIBRACKNSN-UHFFFAOYSA-N |
| CAS DataBase Reference | 7778-50-9(CAS DataBase Reference) |
| EPA Substance Registry System | Potassium dichromate (7778-50-9) |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |      GHS03,GHS05,GHS06,GHS08,GHS09 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H272-H301-H312-H314-H317-H330-H334-H335-H340-H350-H360FD-H372-H410 | |||||||||
| Precautionary statements | P210-P260-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338 | |||||||||
| Hazard Codes | T,N,T+,O | |||||||||
| Risk Statements | 45-46-60-61-8-21-25-26-34-42/43-48/23-50/53-52/53-20-48/20-23-51/53-22-36/37/38-27-20/21-23/24 | |||||||||
| Safety Statements | 53-45-60-61-36/37-23-26 | |||||||||
| RIDADR | UN 3086 6.1/PG 1 | |||||||||
| WGK Germany | 3 | |||||||||
| RTECS | HX7680000 | |||||||||
| TSCA | Yes | |||||||||
| HazardClass | 5.1 | |||||||||
| PackingGroup | III | |||||||||
| HS Code | 28415000 | |||||||||
| Toxicity | LD50 orally in Rabbit: 90.5 mg/kg LD50 dermal Rat 1170 mg/kg | |||||||||
| NFPA 704 |
|
Potassium dichromate price More Price(34)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich(India) | P5271 | Potassium dichromate ReagentPlus?, ≥99.5% | 7778-50-9 | 25G | ₹4600.63 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | P5271 | Potassium dichromate ReagentPlus?, ≥99.5% | 7778-50-9 | 500G | ₹4936.2 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | P5271 | Potassium dichromate ReagentPlus?, ≥99.5% | 7778-50-9 | 2KG | ₹10554.38 | 2022-06-14 | Buy |
| Sigma-Aldrich(India) | P2588 | Potassium dichromate BioXtra, ≥99.5% | 7778-50-9 | 250G | ₹10651.8 | 2022-06-14 | Buy |
| Sigma-Aldrich | 483044 | Potassium dichromate 99.98% trace metals basis | 7778-50-9 | 10G | ₹18402.5 | 2022-06-14 | Buy |
Potassium dichromate Chemical Properties,Uses,Production
Chemical Properties
Also known as potassium bichromate and red potassium chromate, K2Cr2O7 is poisonous,yellowish-red crystals with a metallic taste that is soluble in water,insoluble in alcohol,that melt at 396℃;and decompose at 500℃. Used as an oxidizing agent and analytical reagent,and in explosives, matches, and electroplating.
Uses
Potassium bichromate is also known as potassium dichromate, this bright orange crystal was made by the acidification of potassium chromate. It is toxic and an oxidant and is soluble in water but not in alcohol. In 1839 Mungo Ponton sensitized paper with a solution of potassium bichromate to print-out images in the sun. The most important use of potassium bichromate was used to make colloids sensitive to light for a variety of processes such as the photoglyphic engraving process, the carbon process, the gum bichromate process, and in the preparation of the gelatin relief used to make lead molds for the Woodburytype.
Definition
ChEBI: A potassium salt that is the dipotassium salt of dichromic acid.
General Description
Orange red crystals. Denser than water and soluble in water. No distinctive odor. May severely irritate the eyes and respiratory tract. Avoid contact with organic materials. Noncombustible. Used in pyrotehnic displays with tungsten and iron.
Air & Water Reactions
Soluble in water.
Reactivity Profile
Potassium or sodium dichromate reacts explosively with hydrazine [Mellor 11:234. 1946-47]. A drop of anhydrous hydroxylamine on powdered potassium dichromate produces a violent explosion [Mellor 8:293. 1946-47].
Hazard
Toxic by ingestion and inhalation. Dan- gerous fire risk in contact with organic materials. Strong oxidizing agent.
Health Hazard
Highly corrosive to skin and mucous membranes. If ingested, causes violent gastroenteritis, peripheral vascular collapse, vertigo, muscle cramps, coma, and (later) toxic nephritis with glycosuria. Allergic reactions may also occur.
Fire Hazard
Behavior in Fire: May decompose, generating oxygen. Supports the combustion of other materials.
Industrial uses
This material, K2Cr2O7, decomposes at 500°C.Bright yellowish-red crystals are soluble andpoisonous. Sometimes potassium chromate,K2Cr2O4, and the dichromate are utilized inceramics as coloring agents.
Potassium dichromate is used in glass foraventurine effects. It is said that 20 or 21 partsto 100 parts sand will give a chrome aventurine.This glass is characterized by glittering metallicscales of chromium oxide. Potassiumdichromate is also used in glass to give a greencolor. However, it has been shown that it may cause considerable trouble by formation ofblack, chrome corundum crystals in the glass.Air-floated chromite is suggested to avoid thisproblem.
Potassium dichromate is used in glazes toproduce chrome-tin pinks, low-fire reds, greens,and purplish-red colors.
Safety Profile
Human poison by ingestion. An experimental poison by ingestion, intraperitoneal, intravenous, and subcutaneous routes. Human mutation data reported. An experimental teratogen. Other experimental reproductive effects. Flammable by chemical reaction. A powerful oxidzer. Explosive reaction with hydrazine. Reacts violently or ignites with H2SO4+ acetone, hydroxylamine, ethylene glycol (above 100℃). Forms pyrotechnic mixtures with boron + dion, iron (igmtes at 1090℃), tungsten (igmtes at 1700℃). Reacts with sulfuric acid to form the strong oxidant chromic acid. Used in photomechanical processing, chrome pigment production, and wool preservation methods. When heated to decomposition it emits toxic fumes of K2O. See also CHROMIUM COMPOUNDS.
Potential Exposure
Potassium chromate is used in printing: photomechanical processing; chrome-pigment production; and wool preservative methods; to make dyes, pigments, inks and enamels; as an oxidizing agent; analytical reagent; in electroplating; explosives.
Shipping
UN1479 Oxidizing solid, n.o.s., Hazard Class: 5.1; Labels: 5.1-Oxidizer, Technical Name Required. UN3288 Toxic solids, inorganic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required
Purification Methods
Crystallise it from water (g/mL) between 100o and 0o and dry it under vacuum at 156o. (Possible CARCINOGEN.)
Incompatibilities
A powerful oxidizer. Violent reactions with combustibles, organics, powdered metals; or easily oxidizable substances. Contact with hydroxylamine, hydrazine causes explosion.
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