Calcium acetate

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Calcium acetate
Calcium acetate.png
Ca-acetate.png
Calcium acetate crystals
Names
IUPAC name
Calcium acetate
Other names
Acetate of lime
Calcium ethanoate
Calcium diacetate
Identifiers
62-54-4 YesY
5743-26-0 (monohydrate) N
Abbreviations Ca(OAc)2
ChEBI CHEBI:3310 YesY
ChEMBL ChEMBL1200800 N
ChemSpider 5890 YesY
DrugBank DB00258 YesY
EC Number 269-613-0
Jmol 3D model Interactive image
PubChem 6116
RTECS number AF7525000
UNII Y882YXF34X YesY
  • InChI=1S/2C2H4O2.Ca/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2 YesY
    Key: VSGNNIFQASZAOI-UHFFFAOYSA-L YesY
  • InChI=1/2C2H4O2.Ca/c2*1-2(3)4;/h2*1H3,(H,3,4);/q;;+2/p-2
    Key: VSGNNIFQASZAOI-NUQVWONBAW
  • [Ca+2].[O-]C(=O)C.[O-]C(=O)C
Properties
C4H6CaO4
Molar mass 158.17 g·mol−1
Appearance White solid
hygroscopic
Odor slight acetic acid odor
Density 1.509 g/cm3
Melting point 160 °C (320 °F; 433 K)[1] decomposition to CaCO3 + acetone
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) 6.3-9.6
1.55
Pharmacology
ATC code V03AE07
Vapor pressure {{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
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

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.

Uses

  • 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.[citation needed]
  • Calcium acetate is used as a food additive, as a stabilizer, buffer and sequestrant, mainly in candy products under the number E263. It also neutralizes fluoride in water.[2]
  • Because it is inexpensive, calcium acetate was once a common starting material for the synthesis of acetone before the development of the cumene process:[3][4]
Ca(CH3COO)2 → CaCO3(s) + (CH3)2CO(v)
  • A saturated solution of calcium acetate in alcohol forms a semisolid, flammable gel forms that is much like "canned heat" products such as Sterno.[5]
    • Chemistry teachers often prepare "California Snowballs", a mixture of calcium acetate solution and ethanol.[6] The resulting gel is whitish in color, and can be formed to resemble a snowball.

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ Polymeric calcium phosphate cements: setting reaction modifiers
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ "Canned Heat" at Journal of Chemical Education "Chemistry comes alive!"
  6. ↑ Chemistry Teaching Resources
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