I. Basic information
Chinese name: formaldehyde
English name: glyoxal
Accurate: formaldehyde, formaldehyde
Chemical formula: c2h2o2
Molecular weight: 58. 036 (or 58. 04, possibly slightly different from different sources)
Cas login: 107-22-2
Einecs login: 203-474-9
Ii. Physical nature
Appearances: usually white or grey crystal powders, sometimes in yellow leather or irregular form, which can become white when cooled。
Melting points: the melting points given from different sources vary slightly, generally between 14°c and 15°c。
Boiling point: about 50. 0°c to 51. 0°c (specific values may vary depending on the measurement conditions)。
Density: approximately 1. 0 g/cm3 to 1. 27 g/ml at 25°c, depending on state (solid or liquid)。
Solvability: is soluble in water and in common organic solvents such as ethanol and ether。
Vapour density: greater than vs air。
Vapour pressure: about 291. 7 mmhg at 25°c。
Flash points: about -4. 3°c to 104°c (depending on the measurement conditions and state of the compound)。
Chemical properties
Ethyldehyde is the simplest formaldehyde, made up of two formaldehyde (-cho)。
Its vapours are green, burning with purple flames。
Ethyldehyde is highly reductive and can cause combustion explosions in heat, open fire, oxidizers, pyro-sulphate, chlorsulfonic acid, etc。
Exposure to water energy is intensely aggregated and self-assembly occurs during storage and use。
The chemical properties of the acetaldehyde are active and react with ammonium, ammonium, formaldehyde and aluminum-containing compound
