160 °C (320 °F; 433 K)[2] decomposition to CaCO3 + acetone
Solubility in water
37.4 g/100 mL (0 °C) 34.7 g/100 mL (20 °C) 29.7 g/100 mL (100 °C)
Solubility
slightly soluble in methanol, hydrazine insoluble in acetone, ethanol and benzene
Acidity (pKa)
ca. 0.7
Magnetic susceptibility (χ)
−70.7·10−6 cm3/mol
Refractive index (nD)
1.55
Pharmacology
ATC code
V03AE07 (WHO)
Hazards
NFPA 704 (fire diamond)
110
Autoignitiontemperature
680 to 730 °C (1,256 to 1,346 °F; 953 to 1,003 K)
Lethal dose or concentration (LD, LC):
LD50 (median dose)
4280 mg/kg (oral, rat)
Related compounds
Other cations
Magnesium acetate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Nverify (what is YN ?) Infobox references
Chemical compound
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:
Since both reagents would have been available pre-historically, the chemical would have been observable as crystals then.
Uses
[edit]
In kidney disease, blood levels of phosphate may rise (called hyperphosphatemia) leading to bone problems. Calcium acetate binds phosphate in the diet to lower blood phosphate levels.[3]
Calcium acetate is used as a food additive, as a stabilizer, buffer and sequestrant, mainly in candy products under the number E263.
Tofu is traditionally obtained by coagulating soy milk with calcium sulfate. Calcium acetate has been found to be a better alternative; being soluble, it requires less skill and a smaller amount.[4]
Because it is inexpensive, calcium acetate was once a common starting material for the synthesis of acetone before the development of the cumene process:[5][6]
Ca(CH3COO)2 → CaCO3(s) + (CH3)2CO
A saturated solution of calcium acetate in alcohol forms a semisolid, flammable gel that is much like "canned heat" products such as Sterno.[7] Chemistry teachers often prepare "California Snowballs", a mixture of calcium acetate solution and ethanol.[8] The resulting gel is whitish in color, resembling a snowball and can be lit on fire; it will burn for around 20 minutes.[9]
Natural occurrence
[edit]
Pure calcium acetate is yet unknown among minerals. Calclacite—calcium acetate chloride pentahydrate—is listed as a known mineral,[10] but its genesis is anthropogenic (human-generated, as opposed to naturally occurring).[11]
References
[edit]
^International Union of Pure and Applied Chemistry (2014). Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013. The Royal Society of Chemistry. p. 801. doi:10.1039/9781849733069. ISBN 978-0-85404-182-4.
^Dale L. Perry (May 19, 2011). Handbook of Inorganic Compounds (Second ed.). Taylor & Francis. p. 84. ISBN 978-1-4398-1461-1.
^"Calcium Acetate". Mayo Clinic. Retrieved 19 November 2019.
^Lu, J. Y.; Carter, Eloise; Chung, R. A. (1980). "Use of Calcium Salts for Soybean Curd Preparation". Journal of Food Science. 45: 32–34. doi:10.1111/j.1365-2621.1980.tb03864.x.
^Leo Frank Goodwin; 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.
^E. G. R. Ardagh; A. D. Barbour; G. E. McClellan; E. W. McBride (1924). "Distillation of Acetate of Lime". Industrial & Engineering Chemistry. 16 (11): 1133–1139. doi:10.1021/ie50179a013.
^""Canned Heat" at Journal of Chemical Education "Chemistry comes alive!"". Archived from the original on 2008-10-03. Retrieved 2008-03-26.
^"Chemistry Teaching Resources". University of Manitoba. Archived from the original on 2011-09-23.
^"CA (California) Snowball". LibreTexts. University of California Davis. Retrieved 2024-12-31.
^"Calclacite". mindat.org. Archived from the original on 2017-01-20. Retrieved 2024-12-31.
^"Man made minerals". The Australian Museum. New South Wales Government. 2022-12-08. It [calclacite] owes its existence to humans – it only grows naturally in old oak drawers as it forms when calcium-rich rocks or fossils react with acetic acid in the wood.
v
t
e
Drugs for treatment of hyperkalemia and hyperphosphatemia (V03AE)
Potassium binders
Patiromer
Polystyrene sulfonate
Sodium zirconium cyclosilicate
Phosphate binders
Aluminium hydroxide
Calcium acetate
Calcium acetate/magnesium carbonate
Calcium carbonate
Colestilan
Lanthanum carbonate
Sevelamer
Sucroferric oxyhydroxide
v
t
e
Acetyl halides and salts of the acetate ion
AcOH
He
LiOAc
Be(OAc)2Be4O(OAc)6
B(OAc)3B2O(OAc)4
AcOAcROAc
NH4OAc
AcOOH
FAcFOAc
Ne
NaOAcNaH(OAc)2
Mg(OAc)2
Al(OAc)3"ALSOL"Al(OAc)2OHAl(OH)2OAcAl2SO4(OAc)4
Si
P
S
ClAcClOAc
Ar
KOAc
Ca(OAc)2
Sc(OAc)3
Ti(OAc)4
VO(OAc)2
Cr(OAc)2Cr(OAc)3
Mn(OAc)2Mn(OAc)3
Fe(OAc)2Fe(OAc)3
Co(OAc)2
[CoO(OAc)py]4
Ni(OAc)2
CuOAcCu(OAc)2
Zn(OAc)2
Ga(OAc)3
Ge
As(OAc)3
Se
BrAcBrOAc
Kr
RbOAc
Sr(OAc)2
Y(OAc)3
Zr(OAc)4
Nb
Mo(OAc)2
Tc
Ru2(OAc)4ClRu(OAc)3
Rh2(OAc)4
Pd(OAc)2
AgOAc
Cd(OAc)2
In(OAc)3
Sn(OAc)2Sn(OAc)4
Sb(OAc)3
Te
IAcIOAcI(OAc)3
Xe
CsOAc
Ba(OAc)2
*
Lu(OAc)3
Hf
Ta
W
Re
Os
Ir
Pt(OAc)2
Au(OAc)3
Hg2(OAc)2Hg(OAc)2
TlOAcTl(OAc)3
Pb(OAc)2Pb(OAc)4
Bi(OAc)3
Po
At
Rn
Fr
Ra
**
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Cn
Nh
Fl
Mc
Lv
Ts
Og
*
La(OAc)3
Ce(OAc)3
Pr(OAc)3
Nd(OAc)3
Pm
Sm(OAc)3
Eu(OAc)3
Gd(OAc)3
Tb(OAc)3
Dy(OAc)3
Ho(OAc)3
Er(OAc)3
Tm(OAc)3
Yb(OAc)3
**
Ac(OAc)3
Th(OAc)4
Pa
U(OAc)4
UO2(OAc)2
NpO2OAcNpO2(OAc)2
PuO2(OAc)2
Am
Cm
Bk
Cf
Es
Fm
Md
No
v
t
e
Calcium compounds
Hydrogen & halogens
CaH2
CaF2
CaCl2
Ca(ClO)2
Ca(ClO3)2
Ca(ClO4)2
CaClOH
CaBr2
Ca(BrO3)2
CaI2
Ca(IO3)2
CaICl
Chalcogens
CaO
CaO2
Ca(OH)2
CaS
CaSO3
CaH2S2O6
CaSO4
CaSe
Pnictogens
Ca3N2
CaN6
Ca(NO2)2
Ca(NO3)2
Ca3P2
CaP
Ca4(PO4)2O
Ca3(PO4)2
CaHPO4
Ca(H2PO4)2
Ca2P2O7
CaAs
Ca3(AsO4)2
Group 13 & 14
CaC2
Ca(CN)2
CaCN2
CaCO3
Ca(HCO3)2
CaSi
CaSi2
Ca2SiO4
Ca3(BO3)2
CaAl2O4
Ca3Al2O6
Trans metals
Ca(MnO4)2
CaCrO4
CaTiO3
Organics
CaC2O4
Ca(HCO2)2
Ca(CH3CO2)2
Ca(C3H5O2)2
CaC4H2O4
Ca3(C6H5O7)2
C3H7CaO6P
Ca(C6H5O5S)2
Ca(C6H7O6)2
C10H11CaN4O8P
CaC10H12O4N5PO4
C10H16CaN2O8
C12H22CaO14
C14H26CaO16
C18H32CaO19
C36H70CaO4
C24H40B2CaO24
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