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|Other names|| Carbon monooxide|
|Molar mass||28.010 g mol−1|
|Appearance||colourless, odorless gas|
|Density|| 0.789 g mL−1, liquid|
1.250 g L−1 at 0 °C, 1 atm
1.145 g L−1 at 25 °C, 1 atm
−205 °C, 68 K, -337 °F
−191.5 °C, 82 K, -313 °F
|Solubility in water||2.6 mg/100 mL (20 °C)|
|Solubility||soluble in chloroform, acetic acid, ethyl acetate, ethanol, ammonium hydroxide|
|Dipole moment||0.112 D|
|EU classification|| Highly flammable (F+)|
Very toxic (T+)
|Flash point||−191 °C|
|Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)|
Carbon monoxide, also known as coal gas, with the chemical formula CO, is a colorless, odorless, and tasteless gas. It consists of one carbon atom covalently bonded to one oxygen atom. It is made when carbon compounds burn and there is not enough oxygen. It is a good fuel and burns in air with a blue flame, making carbon dioxide. It is very toxic, but it is useful for modern technology as well.
The most important use for carbon monoxide in industry is making iron from iron ore. The carbon monoxide takes the oxygen from the iron ore when heated in a large oven called a blast furnace. Liquid metal iron is left behind. The carbon monoxide turns into carbon dioxide.
Carbon monoxide can accidentally form when there are too little air to burn all the fuel into carbon dioxide. Such situation may happen if the oven shutters are closed too early or if a mobile cooker is used in a small tent with no ventilation (= fresh air coming in and smoke going out). Many people have died from carbon monoxide poisoning. Carbon monoxide poisoning can cause feelings of paranoia and hallucinations, and has been determined to be a major cause of "haunted" houses.
Despite that it is a poison, carbon monoxide is very useful in chemical industry so lots of ways of making it have been discovered. Normally we burn coke at high temperature with not enough oxygen. The chemical equation for this is:
- 2C + O2 → 2CO
It can be also made by blowing hot steam through red-hot crushed coke
- C + H2O → CO + H2
Carbon monoxide can be used as heating fuel because it burns easily into carbon dioxide. It can also be used as so-called "synthesis gas" for making man-made gasoline in the Fischer-Tropsch process.
During the World War II when petrol was rare and reserved for the military, many cars were converted to use wood gas. It is carbon monoxide made by burning wood chips in insufficient amount of air. The wood gas was made in a special oven called generator, which was carried on the car. The resulting carbon monoxide was then used as fuel for the car itself. Even today there are cars which use wood gas as fuel.
- Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.
- International Chemical Safety Card 0023
- National Pollutant Inventory - Carbon Monoxide
- NIOSH Pocket Guide to Chemical Hazards
- United States Environmental Protection Agency Carbon Monoxide page
- External MSDS data sheet
- Carbon Monoxide Kills Campaign Site
- Carbon Monoxide information for victims of poisoning
- Carbon Monoxide Hazards with Backpacking Stoves
- USFDA IMPORT BULLETIN 16B-95, May 1999
- FDA Agency Response Letter GRAS Notice No. GRN 000083
- Carbon Monoxide in Fresh Meat site
- Radiology and Pathology of CO Poisoning Images from MedPix