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 It is a synthetic compound commonly produced by reaction acetic acid with calcium hydroxide (limestone) or calcium carbonate (hydrated lime).

The following are two manufacturing methods:

Neutralization acetic acid with calcium hydroxide. Equation: 2CH3COOH + Ca(OH)2/CaCO3 → (CH3COO)2Ca + 2H2O
An exothermic reaction between calcium oxide and glacial acetic acid. Equation: 2CH3COOH + CaO → (CH3COO)2Ca + H2O
Specification
A white crystalline powder or granular. The anhydrous form is hygroscopic which absorbs water.

Calcium acetate is the strong conjugate base of acetic acid. When dissolved in water, it dissociates CH3COO- ions and Ca+, and forms acetic acid (CH3COOH) and CaOH after these two ions reaction with water respectively, CH3COO- combines with H+, and Ca+ reacts with OH-.

Other names    Lime acetate, Vinegar salts
CAS number    62-54-4 (Anhydrous), 5743-26-0 (Monohydrate)
Chemical formula    C4H6O4Ca (Anhydrous), C4H6O4Ca·H2O (Monohydrate)
Molecular weight    158.17(Anhydrous), 176.18 (Monohydrate)
PH    neutralizes acids and raises pH Alkalinity, 6.0-9.0 (10% aqueous solution)
Solubility    freely soluble in water and slightly soluble in ethanol.