Natriumacetat

Natriumacetat
Strukturformel af natriumacetat
Natriumacetat
IUPAC-navn
Natriumacetat
Generelt
Systematisk navnNatriumethanoat
Andre navneVarm is
ForkortelserNaOAc
MolekylformelCH3COONa
Molarmasse82,03 g/mol
FremtrædenHvidt pulver
CAS-nummer127‑09‑3
EC-nummer204-823-8
PubChem517045
SMILES[Na+].[O-]C(=O)C
ATC KodeB05XA08
InChI1/C2H4O2.Na/c1-2(3)4;/h1H3,(H,3,4);/q;+1/p-1
E-nummerE262
Kemiske egenskaber
Massefylde1,528 g/cm3 (20 °C, vandfri)
1,45 g/cm3 (20 °C, trihydrat)[1]
Opløselighed i vandVandfri:
119 g/100 mL (0 °C)
123,3 g/100 mL (20 °C)
125,5 g/100 mL (30 °C)
137,2 g/100 mL (60 °C)
162,9 g/100 mL (100 °C)
Trihydrat:
32,9 g/100 mL (-10 °C)
36,2 g/100 mL (0 °C)
46,4 g/100 mL (20 °C)
82 g/100 mL (50 °C)[2]
OpløselighedOpløselig i alkohol, hydrazin og SO2[3]
Smeltepunkt324 °C (597 K)
Kogepunkt881,4 °C (1154,5 K)
Syrestyrkekonstant
(pKa)
24 (20 °C)[3]
4,76 (CH3COOH, korresponderende syre)[4]
Basestyrkekonstant
(pKb)
9,25
Refraktionsindeks1,464
Struktur
KrystalstrukturMonoklin
Termokemi
DeltaHf-709,32 kJ/mol (vandfri)[3]
-1604 kJ/mol (trihydrat)[1]
Std. molar entropi So298138,1 J·mol-1·K-1 (vandfri)[5]
262 J·mol-1·K-1 (trihydrat)[1]
Std. molar
varmekapacitet
, cpo
100,83 J·mol-1·K-1 (vandfri)[5]
229 J·mol-1K-1 (trihydrat)[6]
Explosive data
RE Faktor9,25
Sikkerhed
Største risiciLokalirriterende
NFPA 704
Flammepunkt>250 °C (523 K)
Selvantændelses-temperatur600 °C (873 K)
LD503530 mg/kg (oralt, rotte)
Beslægtede stoffer
Andre anionerNatriumformiat
Natriumpropionat
Andre kationerKaliumacetat
Calciumacetat
Hvis ikke andet er angivet, er data givet for
stoffer i standardtilstanden (ved 25 °C, 100 kPa)
Natriumacetat.

Natriumacetat, CH3COONa, er natriumsaltet af eddikesyre. Det forkortes NaOAc og har det systematiske navn natriumethanoat. Et klassisk kemisk demonstrationsforsøg går ud på at hælde en overmættet opløsning af natriumacetat på en podekrystal, hvorved der dannes en varm "istap" af fast natriumacetat.

Referencer

  1. ^ a b c http://chemister.ru/Database/properties-en.php?dbid=1&id=1510 (engelsk)
  2. ^ Seidell, Atherton; Linke, William F. (1952). Solubilities of Inorganic and Organic Compounds. Van Nostrand. (engelsk)
  3. ^ a b c http://chemister.ru/Database/properties-en.php?dbid=1&id=172 (engelsk)
  4. ^ "Sodium acetate" på kemikalieleverandøren Sigma-Aldrichs hjemmeside (besøgt 13. august 2016). (engelsk)
  5. ^ a b "Acetic acid, sodium salt" i Linstrom, P.J., og Mallard, W.G. (eds.). NIST Chemistry WebBook, NIST Standard Reference Database Number 69. National Institute of Standards and Technology, Gaithersburg, MD. http://webbook.nist.gov (besøgt 13. august 2016) (engelsk)
  6. ^ "Acetic acid, sodium salt, hydrate (1:1:3)" i Linstrom, P.J., og Mallard, W.G. (eds.). NIST Chemistry WebBook, NIST Standard Reference Database Number 69. National Institute of Standards and Technology, Gaithersburg, MD. http://webbook.nist.gov (besøgt 13. august 2016). (engelsk)

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