Lead(II) acetate

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  Lead(II) acetate   
Names: lead(II) acetate
lead dicetate
plumbous acetate
lead(II) ethanoate
lead sugar
sugar of lead
sugar acetate
salt of Saturn

Formula: Pb(CH3COO)2
Pb(CH3COO)2 · 3H2O
SMILES: CC(=O)O[Pb]OC(=O)C
Molar mass: 325.288 g/mol (anhydrous)
379.332 g/mol (trihydrate)
Density: 3.25 g/cm3 (anhydrous)
2.55 g/cm3 (trihydrate)
Crystal system: monoclinic (trihydrate)
a=15.85 Å
15.8500 Å
1.5850 nm
, b=7.3 Å
7.3000 Å
0.7300 nm
, c=9.1 Å
9.1000 Å
0.9100 nm
α=90°
90°  
, β=109.8°
109°47′60.0″  
, γ=90°
90°  

Forms:
https://media.crystalls.info/w/uploads/media/Truncated_tetragonal_bipyramid.json


https://media.crystalls.info/w/uploads/media/Prolongated_hexagonal_prism.json


https://media.crystalls.info/w/uploads/media/Prolongated_tetragonal_pedion.json


Color: colorless
Melting point: 280°C
553.15 K
536 °F
995.67 °R
(anhydrous)
75°C
348.15 K
167 °F
626.67 °R
(trihydrate)
Electrical properties: dielectric
Magnetic properties: diamagnetic
Stability: erodes during a day (trihydrate)
Hardness: fragile
Toxicity: poisonous

Description

Organic compound, salt of bivalent metal lead and organic acetic acid. From water solutions crystallizes as trihydrate.

Synthesis

Reaction between lead(II) oxide, hydroxide or carbonate and acetic acid

Chemical equation:

2CH3COOH + PbO = Pb(CH3COO)2 + H2O
2CH3COOH + Pb(OH)2 = Pb(CH3COO)2 + 2H2O
2CH3COOH + PbCO3 = Pb(CH3COO)2 + 2H2O + CO2

For preparation 100g of lead acetate trihydrate a 70.44g of carbonate, 63.59g of hydroxide or 58.84g of oxide and 45.23g of 70% acetic acid, 105.54g of 30% acetic acid or 351.80g of 9% acetic acid is required.

Add acid to the flask, then add small parts of lead 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 pure lead powder and acetic acid

This process is enough slow, but with heating and under the influence of athospheric oxygen or other oxidizers it becomes much faster. The best result gives using a chlorine bleach. Chemical equation:

2CH3COOH + Pb + NaClO = Pb(CH3COO)2 + NaCl + H2O

For preparation 100g of lead acetate trihydrate a 54.62g of lead pure, 490.61g of bleach and 45.23g of 70% acetic acid, 105.54g of 30% acetic acid or 351.80g of 9% acetic acid is required.

Add hot acid solution to the flask, then add bleach and lead pieces, shavings or powder and stir and heat it until gas emission will stop.

Influence of pH level

Decreasing pH level with, for example, acetic acid, leads to growing more flat crystals.

Storage conditions

For crystal storing use hermetic vessel with small amount of saturated solution at the bottom or place wadding moistened with such solution. You can use such alternatives as vessel with vaseline or vegetable oil, organic non-hygroscopic solvent (kerosene, benzine or paraffin). Also you can use acrylate polymer or another kinds of solidifying plastic.

Solubility

Temperatureg/100g of waterg/100g of ethanolg/100g of methanolg/100g of glycerolg/100g of formic acid 95%
(anhydrous)(trihydrate)(anhydrous)(anhydrous)(trihydrate)(anhydrous)(trihydrate)(anhydrous)
0°C
273.15 K
32 °F
491.67 °R
19.8
19.8 g/100g
16.528 %
~23.9
23.9 g/100g
19.29 %
10°C
283.15 K
50 °F
509.67 °R
29.5
29.5 g/100g
22.78 %
~36.2
36.2 g/100g
26.579 %
15°C
288.15 K
59 °F
518.67 °R
~36.9
36.9 g/100g
26.954 %
~46.0
46 g/100g
31.507 %
~35.73
35.73 g/100g
26.324 %
74.75
74.75 g/100g
42.775 %
20
20 g/100g
16.667 %
20°C
293.15 K
68 °F
527.67 °R
44.31
44.31 g/100g
30.705 %
~55.8
55.8 g/100g
35.815 %
143
143 g/100g
58.848 %
25°C
298.15 K
77 °F
536.67 °R
55.2
55.2 g/100g
35.567 %
~70.9
70.9 g/100g
41.486 %
0.4
0.4 g/100g
0.398 %
0.99
0.99 g/100g
0.98 %
30°C
303.15 K
86 °F
545.67 °R
69.5
69.5 g/100g
41.003 %
~91.6
91.6 g/100g
47.808 %
40°C
313.15 K
104 °F
563.67 °R
116
116 g/100g
53.704 %
~167.6
167.6 g/100g
62.631 %
50°C
323.15 K
122 °F
581.67 °R
218.3
218.3 g/100g
68.583 %
~399.4
399.4 g/100g
79.976 %
70°C
343.15 K
158 °F
617.67 °R
102.75
102.75 g/100g
50.678 %
214.95
214.95 g/100g
68.249 %
Soluble in acetic acid and isopropanol. Slightly soluble in ethanol.

Gallery

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