Zinc acetate

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  Zinc acetate   
Names: zinc acetate
zinc diacetate
zinc ethanoate

Formula: Zn(CH3COO)2 (anhydrous)
Zn(CH3COO)2 · 2H2O (dihydrate)
SMILES: CC(=O)[O-].CC(=O)[O-].[Zn+2]
Molar mass: 183.478 g/mol (anhydrous)
219.507 g/mol (dihydrate)
Density: 1.84 g/cm3 (anhydrous)
1.735 g/cm3 (dihydrate)
Crystal system: tetragonal (anhydrous)
α=90°
90°  
, β=90°
90°  
, γ=90°
90°  

monoclinic (dihydrate)
a=14.5 Å
14.5000 Å
1.4500 nm
, b=5.32 Å
5.3200 Å
0.5320 nm
, c=11.02 Å
11.0200 Å
1.1020 nm
α=90°
90°  
, β=100°
100°  
, γ=90°
90°  

Shapes:
https://media.crystalls.info/w/uploads/media/Hexagonal_flat_prism.json
https://media.crystalls.info/w/uploads/media/Trigonal_flat_prism.json

Color: colorless
Decomposition point: 237 °C
510.15 K
458.6 °F
918.27 °R
(anhydrous)
Refractive index: 1.357 (dihydrate)
Magnetic properties: diamagnetic
χ=-1.01 · 10-4cm³/mol
Stability: stable (dihydrate)
Hardness: fragile
Toxicity: non-toxic
LD50=2510mg/kg

Description

Organic compound, salt of transitional metal zinc and organic acetic acid. From water solutions crystallizes as dihydrate.

Precursors

Reaction between zinc hydroxycarbonate, hydroxide or oxide and acetic acid

Chemical equation:

4CH3COOH + Zn2(CO3)(OH)2 = 2Zn(CH3COO)2 + 3H2O + CO2
2CH3COOH + Zn(OH)2 = Zn(CH3COO)2 + 2H2O
2CH3COOH + ZnO = Zn(CH3COO)2 + H2O

For preparation of 100.00g of zinc acetate dihydrate а 51.21g of hydroxycarbonate or 45.28g of hydroxide or 37.08g of oxide and 78.16g of 70% acetic acid is required.
Add acid to the flask, then add small parts of zinc compound with stirring until it will totally dissolve or, if you use carbonate, until carbon dioxide emission will stop. After reaction will stop, filter the solution and use it for crystal growing.

Reaction between zinc powder and acetic acid

Chemical equation:

2CH3COOH + Zn = Zn(CH3COO)2 + H2

For preparation of 100.00g of zinc acetate dihydrate а 29.79g of pure zinc and 78.16g of 70% acetic acid is required.
Add hot acid solution to the flask, then add zinc pieces, shavings or powder and stir it until gas emission will stop.

Electrolysis of acetic acid solution with zinc anode

Chemical equation:

2CH3COOH + Zn —electrolysis→ Zn(CH3COO)2 + H2

For preparation of 100.00g of zinc acetate dihydrate а 29.79g of zinc and 78.16g of 70% acetic acid is required.
Add to the flask acid acetic solution, then place there zinc electrodes and plug them to 1.5-5 V power supply. After some time crystal growth will begin at cathode.

Reaction between zinc chloride, sulfate or nitrate and excess of concentrated acetic acid

Chemical equation:

2CH3COOH + ZnCl2 = Zn(CH3COO)2↓ + 2HCl
2CH3COOH + ZnSO4 = Zn(CH3COO)2↓ + H2SO4
2CH3COOH + Zn(NO3)2 = Zn(CH3COO)2↓ + 2HNO3

For preparation of 100.00g of zinc acetate dihydrate а 94.92g of zinc chloride tetrahydrate or 131.00g of zinc sulfate heptahydrate or 135.52g of zinc nitrate hexahydrate and 54.72g of glacial acetic acid is required.
Add to the flask with hot iron compounds solution a acid solution with heating and stirring. Cooling this mixture will cause forming a large amount of crystalline precipitation. Filter precipitate and wash it wish small amount of glacial acetic acid, then filter the solution and use it for crystal growing.

Reaction between zinc nitrate and sodium acetate

Chemical equation:

2NaCH3COO + Zn(NO3)2 = Zn(CH3COO)2↓ + 2NaNO3

For preparation of 100.00g of zinc acetate dihydrate а 135.52g of zinc nitrate hexahydrate and 123.99g of sodium acetate trihydrate is required.
Add to the flask with hot zinc nitrate solution a sodium acetate solution with heating and stirring. Cooling this mixture will cause forming a large amount of crystalline precipitation. Filter precipitate and wash it wish small amount of cold water, then filter the solution and use it for crystal growing.

Reaction between zinc sulfate and calcium or lead(II) acetate

You can use zinc chloride instead of sulfate if you use lead salt..
Chemical equation:

Ca(CH3COO)2 + ZnSO4 = Zn(CH3COO)2 + CaSO4
Pb(CH3COO)2 + ZnSO4 = Zn(CH3COO)2 + PbSO4
Pb(CH3COO)2 + ZnCl2 = Zn(CH3COO)2 + PbCl2

For preparation of 100.00g of zinc acetate dihydrate а 94.92g of zinc chloride tetrahydrate or 131.00g of zinc sulfate heptahydrate and 80.26g of calcium acetate monohydrate or 172.81g of lead(II) acetate trihydrate is required.
Add to the flask with calcium or lead acetate solution small parts of zinc salt solution and stir. The large amount of poorly soluble precipitate will form. Settle it out and discard, then filter the solution carefully.

Influence of impurities

Dirty compound grows as complex polycrystalline prism. After purification changes form to hexagonal prism.

Storage conditions

Store in its original form or under several layers of varnish at average humidity and room temperature. Do not store in matchboxes or cotton wool and do not heat.

Solubility

Temperatureгр/100,00 гр waterгр/100,00 гр ethanolгр/100,00 гр methanolгр/100,00 гр diethyl etherгр/100,00 гр acetic acidгр/100,00 гр hydrazine
(anhydrous)(dihydrate)(anhydrous)(dihydrate)(anhydrous)(anhydrous)(anhydrous)(anhydrous)
20°C
293.15 K
68 °F
527.67 °R
39.86
39.86 g/100g
28.5 %
43
43 g/100g
30.07 %
4.22
4.22 g/100g
4.049 %
4
4 g/100g
3.846 %
25°C
298.15 K
77 °F
536.67 °R
40.15
40.15 g/100g
28.648 %
~44.5
44.5 g/100g
30.796 %
3.5
3.5 g/100g
3.382 %
1.9
1.9 g/100g
1.865 %
30°C
303.15 K
86 °F
545.67 °R
~40.5
40.5 g/100g
28.826 %
~46.0
46 g/100g
31.507 %
40°C
313.15 K
104 °F
563.67 °R
~41.1
41.1 g/100g
29.128 %
~48.9
48.9 g/100g
32.841 %
0.015
0.015 g/100g
0.015 %
50°C
323.15 K
122 °F
581.67 °R
~41.7
41.7 g/100g
29.428 %
~51.9
51.9 g/100g
34.167 %
60°C
333.15 K
140 °F
599.67 °R
~42.3
42.3 g/100g
29.726 %
~54.8
54.8 g/100g
35.401 %
70°C
343.15 K
158 °F
617.67 °R
~42.9
42.9 g/100g
30.021 %
~57.8
57.8 g/100g
36.629 %
1.9
1.9 g/100g
1.865 %
0.1
0.1 g/100g
0.0999 %
0.117
0.117 g/100g
0.117 %
80°C
353.15 K
176 °F
635.67 °R
~43.5
43.5 g/100g
30.314 %
~60.7
60.7 g/100g
37.772 %
221
221 g/100g
68.847 %
90°C
363.15 K
194 °F
653.67 °R
~44.1
44.1 g/100g
30.604 %
~63.7
63.7 g/100g
38.913 %
100°C
373.15 K
212 °F
671.67 °R
44.72
44.72 g/100g
30.901 %
66.6
66.6 g/100g
39.976 %
95.57
95.57 g/100g
48.867 %
Soluble in acetone, aniline and pyridine.

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