Calcium acetate

Calcium acetate

Calcium acetate crystals
Names
Preferred IUPAC name Calcium diacetate[1]
Other names Acetate of lime Calcium ethanoate
Identifiers
CAS Number	62-54-4 Y 5743-26-0 (monohydrate) Y
3D model (JSmol)	Interactive image Interactive image
Abbreviations	Ca(OAc)2
Beilstein Reference	3692527
ChEBI	CHEBI:3310 Y
ChEMBL	ChEMBL1200800 N
ChemSpider	5890 Y
DrugBank	DB00258 Y
ECHA InfoCard	100.000.492
EC Number	269-613-0
E number	E263 (preservatives)
Gmelin Reference	22320
KEGG	D00931 Y
PubChem CID	6116
RTECS number	AF7525000
UNII	Y882YXF34X Y 7ZA48GIM5H (monohydrate) Y
CompTox Dashboard (EPA)	DTXSID0020234
InChI InChI=1S/2C2H4O2.Ca/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Y Key: VSGNNIFQASZAOI-UHFFFAOYSA-L Y InChI=1/2C2H4O2.Ca/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 Key: VSGNNIFQASZAOI-NUQVWONBAW
SMILES CC(=O)O[Ca]OC(=O)C [Ca+2].[O-]C(=O)C.[O-]C(=O)C
Properties
Chemical formula	C4H6CaO4
Molar mass	158.166 g/mol (anhydrous) 176.181 g/mol (monohydrate)
Appearance	White solid hygroscopic
Odor	slight acetic acid odor
Density	1.509 g/cm3
Melting point	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)	1 1 0
Autoignition temperature	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). N verify (what is YN ?) 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.

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(aq) → Ca(CH₃COO)₂(aq) + H₂O(l) + CO₂(g)

Ca(OH)₂(s) + 2CH₃COOH(aq) → Ca(CH₃COO)₂(aq) + 2H₂O(l)

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

• 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, and can be formed to resemble a snowball.

Pure calcium acetate is yet unknown among minerals. Calclacite—calcium acetate chloride pentahydrate—is listed as a known mineral,^[9] but its genesis is likely anthropogenic (human-generated, as opposed to naturally occurring).^{[10][failed verification]}

This page was last edited on 3 March 2024, at 23:45