Formaldehyde is also used in the Mannich reaction of the aldehyde. Formaldehyde gas in the air by s

Formaldehyde (HCHO) is a colorless soluble irritant gases, also known as ants aldehyde, aldehyde is the simplest, is a normally flammable, colorless and irritating gases. Formaldehyde can be absorbed through the respiratory tract, the solution also called fuchs "formalin" can be absorbed through the digestive tract. Typically 35-40% formaldehyde solution called "formalin", has antiseptic, used to soak pathology and human and animal specimens. Formaldehyde has adverse effects on human health. Its physical characteristics include the following six points: pure formaldehyde gas is colorless and transparent, with a pungent odor Boiling point -19.5 C flash point of 85 C spontaneous combustion point of 430 C Density 0.815 g / mL (liquid, -20 C), 1.075- 1.085 g / mL (liquid, 37%) easily soluble in water, soluble in alcohol, fuchs ether, acetone, benzene solution. 40% aqueous solution known as formalin; mainly in the form of an aqueous solution fuchs of diol KAI presence; generally also contain small amounts of formaldehyde solution and methanol, a stabilizer to prevent oxidation and polymerization. Chemical characteristics are as follows:
Electrophilic formaldehyde can and aromatic electrophilic fuchs aromatic substitution reactions can occur electrophilic addition to olefins. Cross-Cannizzaro reaction of pentaerythritol with acetaldehyde occurs, which is the preparation of explosives pentaerythritol tetranitrate materials. [2] and the phenolic compound with sodium acetate as the phenolic resin condensation catalyst. With a 4 - substituted phenols react calixarene. [3] the reaction with hydrogen sulfide trithian: [4]
Formaldehyde is also used in the Mannich reaction of the aldehyde. Formaldehyde gas in the air by strong oxidizing potassium permanganate and its reaction. Formaldehyde resins are used in a variety fuchs of building materials, fuchs including plywood, carpet, insulation materials, wood products, flooring, tobacco, renovation fuchs and decoration materials, and because formaldehyde resins will slow continuous release of formaldehyde, formaldehyde, thus becoming one of the common indoor air pollution . Formaldehyde released slowly from the source generally highest in the product formaldehyde freshly released from the first few months, a period of time, the amount of formaldehyde released will gradually decrease. fuchs Formaldehyde
Show RTECS LP8925000 nature of the chemical formula CH 2 O molar mass of 30.03 g mol Appearance colorless gas density 1 kg m -3 (gas) Melting point -117 C (156 K) boiling point of -19.3 C (253.9 K) Solubility fuchs (water)> 100 g/100 ml (20 C) triangular structure of the molecule conformation plane dipole moments 2.33168 (1) D Hazards fuchs term R: R23/24/25 - R34 - R40 - R43 security terms S: S1 / 2 - S26 - S36/37 - S39 - S45 - S51 major hazards of toxic, flammable NFPA 704
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