Acetaldehyde

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Acetaldehyde
Lewis structur o acetaldehyde
Skeletal structur o acetaldehyde
Baw-an-stick model
Space-fillin model
Names
Preferred IUPAC name
Acetaldehyde[3]
Seestematic IUPAC name
Ethanal[3]
Ither names
Acetic aldehyde
Ethyl aldehyde[1]
Acetylaldehyde [2]
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.000.761
EC Nummer 200-836-8
KEGG
RTECS nummer AB1925000
UNII
Properties
C2H4O
Molar mass 44.05 g·mol−1
Appearance Colourless liquid
Odour Etherial
Density 0.784 g·cm−3 (20 °C) [4]

0.7904–0.7928 g·cm−3 (10 °C)[4]

Meltin pynt −123.37 °C (−190.07 °F; 149.78 K)
Bylin pynt 20.2 °C (68.4 °F; 293.3 K)
miscible
Solubility miscible wi ethanol, ether, benzene, toluene, xylene, turpentine, acetone
slichtly soluble in chloroform
log P -0.34
Vapour pressur 740 mmHg (20 °C)[5]
Acidity (pKa) 13.57 [6][7]
Magnetic susceptibility -.5153−6 cm3/g
Refractive index (nD) 1.3316
Viscosity ~0.215 at 20 °C
Structur
Molecular shape trigonal planar (sp²) at C1
tetrahedral (sp³) at C2
2.7 D
Thermochemistry
Staundart molar
entropy
So298
250 J·mol−1·K−1
Std enthalpy o
formation
ΔfHo298
−166 kJ·mol−1
Hazards
Main hazards potential occupational carcinogen[9]
Safety data sheet HMDB
GHS pictograms The flame pictogram in the Globally Harmonized Seestem o Classification an Labelling o Chemicals (GHS)The exclamation-mark pictogram in the Globally Harmonized Seestem o Classification an Labellin of Chemicals (GHS)The health hazard pictogram in the Globally Harmonized Seestem o Classification an Labellin of Chemicals (GHS)[8]
GHS hazard statements H224, H319, H335, H351[8]
GHS precautionary statements P210, P261, P281, P305+351+338[8]
NFPA 704
Flammability code 4: Will rapidly or completely vaporize at normal atmospheric pressur an temperatur, or is readily dispersed in air an will burn readily. Flash pynt ablo 23 °C (73 °F). E.g., propaneHealth code 2: Intense or continued but nae chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroformReactivity code 2: Unnergangs violent chemical chynge at elevatit temperatures an pressurs, reacts violently wi water, or mey form explosive mixturs wi watter. E.g., phosphorusSpecial hazards (white): no codeNFPA 704 four-colored diamond
4
2
2
Flash pynt −39.00 °C; −38.20 °F; 234.15 K
175.00 °C; 347.00 °F; 448.15 K
Explosive leemits 4.0–60%
Lethal dose or concentration (LD, LC):
1930 mg/kg (ratton, oral)
13,000 ppm (ratton),
17,000 ppm (hamster),
20,000 ppm (ratton)[9]
US heal exposur leemits (NIOSH):
PEL (Permissible)
200 ppm (360 mg/m3)[5]
IDLH (Immediate danger)
2000 ppm[5][9]
Relatit compoonds
Relatit aldehydes
Formaldehyde
Propionaldehyde
Relatit compoonds
Ethylene oxide
Except whaur itherwise notit, data are gien for materials in thair staundart state (at 25 °C [77 °F], 100 kPa).
YesY verify (whit is YesYN ?)
Infobox references

Acetaldehyde (seestematic name ethanal) is an organic chemical compoond wi the formula CH3CHO, whiles abbreviatit bi chemists as MeCHO (Me = methyl). It is ane o the maist important aldehydes, occurrin widely in naitur an bein produced on a lairge scale in industrie. Acetaldehyde occurs naiturally in coffee, breid, an ripe fruit,[10] an is produced bi plants.

References[eedit | eedit soorce]

  1. SciFinderScholar (accessed 4 Nov 2009). Acetaldehyde (75-07-0) Substance Detail.
  2. Molecular Pathology and Diagnostics of Cancer p.190
  3. 3.0 3.1 Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 908. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4. 
  4. 4.0 4.1 Stoffdaten Acetaldehyd bei Celanese Chemicals. as of December 1999.
  5. 5.0 5.1 5.2 5.3 NIOSH Pocket Guide tae Chemical Hazards 0001
  6. https://pubchem.ncbi.nlm.nih.gov/compound/formaldehyde#section=Odor-Threshold
  7. http://chemistry.stackexchange.com/questions/12232/acidity-of-aldehydes
  8. 8.0 8.1 8.2 Sigma-Aldrich Co., Acetaldehyde. Retrieved on 2013-07-20.
  9. 9.0 9.1 9.2 "Acetaldehyde". NIOSH. 4 December 2014. Retrieved 12 February 2015. 
  10. Uebelacker, Michael; Lachenmeier, Dirk (2011-06-13). "Quantitative Determination of Acetaldehyde in Foods Using Automated Digestion with Simulated Gastric Fluid Followed by Headspace Gas Chromatography". Journal of Automated Methods and Management in Chemistry. PMC 3124883Freely accessible.