Calcium acetate

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Calcium acetate
Calcium acetate.png
Ca-acetate.png
Calcium acetate crystals
Identifiers
AbbreviationsCa(OAc)2
CAS number62-54-4 YesY, 5743-26-0 (monohydrate) YesY
PubChem6116
ChemSpider5890 YesY
UNIIY882YXF34X YesY
EC number269-613-0
DrugBankDB00258
ChEBICHEBI:3310 YesY
ChEMBLCHEMBL1200800 N
RTECS numberAF7525000
ATC codeA12AA12,(anhydrous)
Jmol-3D imagesImage 1
Properties
Molecular formulaC4H6CaO4
Molar mass158.17 g mol−1
AppearanceWhite solid
hygroscopic
Odorslight acetic acid odor
Density1.509 g/cm3
Melting point160 °C (320 °F; 433 K)[1] decomposition to CaCO3 + acetone
Solubility in water37.4 g/100 mL (0 °C)
34.7 g/100 mL (20 °C)
29.7 g/100 mL (100 °C)
Solubilityslightly soluble in methanol, hydrazine
insoluble in acetone, ethanol and benzene
Acidity (pKa)6.3-9.6
Refractive index (nD)1.55
Hazards
NFPA 704
Autoignition temperature680 to 730 °C (1,256 to 1,346 °F; 953 to 1,003 K)
LD504280 mg/kg (oral, rat)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references
 
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Calcium acetate
Calcium acetate.png
Ca-acetate.png
Calcium acetate crystals
Identifiers
AbbreviationsCa(OAc)2
CAS number62-54-4 YesY, 5743-26-0 (monohydrate) YesY
PubChem6116
ChemSpider5890 YesY
UNIIY882YXF34X YesY
EC number269-613-0
DrugBankDB00258
ChEBICHEBI:3310 YesY
ChEMBLCHEMBL1200800 N
RTECS numberAF7525000
ATC codeA12AA12,(anhydrous)
Jmol-3D imagesImage 1
Properties
Molecular formulaC4H6CaO4
Molar mass158.17 g mol−1
AppearanceWhite solid
hygroscopic
Odorslight acetic acid odor
Density1.509 g/cm3
Melting point160 °C (320 °F; 433 K)[1] decomposition to CaCO3 + acetone
Solubility in water37.4 g/100 mL (0 °C)
34.7 g/100 mL (20 °C)
29.7 g/100 mL (100 °C)
Solubilityslightly soluble in methanol, hydrazine
insoluble in acetone, ethanol and benzene
Acidity (pKa)6.3-9.6
Refractive index (nD)1.55
Hazards
NFPA 704
Autoignition temperature680 to 730 °C (1,256 to 1,346 °F; 953 to 1,003 K)
LD504280 mg/kg (oral, rat)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Calcium acetate is a chemical compound which is a calcium salt of acetic acid. It has the formula Ca(C2H3O2)2. Its standard name is calcium acetate, while calcium ethanoate is the systematic name. An older name is acetate of lime. The anhydrous form is very hygroscopic; therefore the monohydrate (Ca(CH3COO)2•H2O) is the common form.

Production[edit]

Calcium acetate can be prepared by soaking calcium carbonate (found in eggshells, or in common carbonate rocks such as limestone or marble) or hydrated lime in vinegar:

CaCO3(s) + 2CH3COOH(l) → Ca(CH3COO)2(l) + H2O(l) + CO2(g)
Ca(OH)2(s) + 2CH3COOH(l) → Ca(CH3COO)2(l) + 2H2O(l)

Since both reagents would have been available pre-historically, the chemical would have been observable as crystals then.

Uses[edit]

Ca(CH3COO)2 → CaO(s) + CO2(g) + (CH3)2CO(v)

References[edit]

  1. ^ Dale L. Perry (May 19, 2011). Handbook of Inorganic Compounds (Second ed.). Taylor & Francis. p. 84. ISBN 978-1-4398-1461-1. 
  2. ^ Polymeric calcium phosphate cements: setting reaction modifiers
  3. ^ Leo Frank Goodwin and Edward Tyghe Sterne (1920). "Losses Incurred in the Preparation of Acetone by the Distillation of Acetate of Lime.". Industrial & Engineering Chemistry 12 (3): 240–243. doi:10.1021/ie50123a012. 
  4. ^ E. G. R. Ardagh, A. D. Barbour, G. E. McClellan, and E. W. McBride (1924). "Distillation of Acetate of Lime.". Industrial & Engineering Chemistry 16 (11): 1133–1139. doi:10.1021/ie50179a013. 
  5. ^ "Canned Heat" at Journal of Chemical Education "Chemistry comes alive!"
  6. ^ Chemistry Teaching Resources