Sample of zinc acetate dihydrate
| IUPAC name
| Other names
Acetic acid, zinc salt
Acetic acid, zinc(II) salt
| Zn(CH3COO)2 (anhydrous)|
Zn(CH3COO)2·2 H2O (dihydrate)
|Molar mass|| 183.48 g/mol (anhydrous)|
219.50 g/mol (dihydrate)
|Appearance||Colorless crystalline solid|
|Density||1.735 g/cm3 (dihydrate)|
|Melting point|| 100 °C (212 °F; 373 K) (dihydrate, decomposition)|
237 °C (459 °F; 510 K) (anhydrous, decomposition)
| dihydrate: |
43 g/100 ml (20 °C)
|Solubility|| Slightly soluble in acetic acid, acetic anhydride, acetyl chloride, acetone, aniline, benzonitrile, butanol, dimethyl sulfate, dimethylformamide, dioxane, epichlorohydrin, ethanol, methanol, methyl propionate, pyridine, THF|
Almost insoluble in liq. ammonia
Insoluble in bromoacetic acid, liq. SO2, toluene, xylene
|Solubility in acetic acid||0.293566 g/cm3 (at 25 °C)|
|Solubility in ethanol||0.495393 g/cm3 (at 25 °C)|
|Safety data sheet|| Alfa Aesar (anydrous)|
| Copper(II) acetate|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
It is also used as food additive, E650.
Zinc acetate reacts with bases to form insoluble zinc hydroxide:
- Zn(CH3COO)2 + 2 NaOH → 2 CH3COONa + Zn(OH)2
- 2 Zn(AcO)2 → Zn4(AcO)6 + Ac2O
So far this route has not been confirmed.
Zinc acetate is a solid crystalline, soluble in water. Its anhydrous form is hygroscopic and quickly turns into the dihydrate form upon standing in open air. It has a weak acetic smell.
Zinc acetate is available as food supplements and can be purchased online. To obtain the pure compound, you will have to dissolve the product in water and recrystallize it from the solution.
Higher purity Zn(AcO)2 can be purchased from chemical suppliers.
- 2 CH3COOH + Zn → Zn(CH3COO)2 + H2
- 2 CH3COOH + ZnO → Zn(CH3COO)2 + H2O
Vinegar can also be used as cheap source acetic acid. After all the zinc has dissolved, the solution is concentrated and cooled to crystallize solid zinc acetate dihydrate. If vinegar was used, organic residue from the vinegar will be trapped in the zinc acetate crystals. To remove the impurities, crush the resulting crystals and wash them thoroughly with an organic solvent. Multiple recrystallizations might be required to remove all the impurities.
- Grow crystals
- Make zinc metal
- Make glacial acetic acid
- Synthesis of acetic anhydride
Zinc acetate is slightly irritant due to the acetic acid resulting from hydrolysis, though this is not a problem when handling the compound.
Zinc acetate should be stored in closed bottles, away from moisture and acids, in a well ventilated place.
Anhydrous zinc acetate should be kept in air-tight containers.
No special disposal is required for zinc acetate, though it's best to dilute it strongly if you want to pour it down the drain. Alternatively, you can precipitate zinc hydroxide/oxide by adding an alkali to a solution of zinc acetate.