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Lead acetate trihydrate today!
Basic
Information of Lead acetate trihydrate
Chemical Name: Lead acetate trihydrate
Cas No.: 6080-56-4
Molecular Formula: Pb(C2H3O2)2
Chemical Structure:
Lead(II) acetate
(Pb(CH3COO)2), also known as lead acetate, lead diacetate, plumbous acetate,
sugar of lead, lead sugar, salt of Saturn, or Goulard's powder, is a white
crystalline chemical compound with a sweetish taste. It is made by treating
lead(II) oxide with acetic acid. Like other lead compounds, it is toxic. Lead
acetate is soluble in water and glycerin. With water it forms the trihydrate,
Pb(CH3COO)2·3H2O, a colourless or white efflorescent monoclinic crystalline
substance.
The substance is used as a reagent to make
other lead compounds and as a fixative for some dyes. In low concentrations, it
is the principal active ingredient in progressive types of hair colouring dyes.
Lead(II) acetate is also used as a mordant in textile printing and dyeing, and
as a drier in paints and varnishes. It was historically used as a sweetener and
for cosmetics.
Like other lead(II) salts, lead(II) acetate
has a sweet taste, which led to its historical use as a sugar substitute. The
ancient Romans, who had few sweeteners besides honey, would boil must (grape
juice) in lead pots to produce a reduced sugar syrup called defrutum,
concentrated again into sapa. This syrup was used to sweeten wine and to
sweeten and preserve fruit. It is possible that lead(II) acetate or other lead
compounds leaching into the syrup might have caused lead poisoning in those who
consumed it. Lead acetate is no longer used in the production of sweeteners
because of its recognized toxicity. Modern chemistry can easily detect it,
which has almost completely stopped the illegal use that continued decades
after legal use as a sweetener was banned.
Lead(II) acetate paper is used to detect
the poisonous gas hydrogen sulfide. The gas reacts with lead(II) acetate on the
moistened test paper to form a grey precipitate of lead(II) sulfide.
An aqueous solution of lead(II) acetate is
the byproduct of the 50/50 mixture of hydrogen peroxide and white vinegar used
in the cleaning and maintenance of stainless steel firearm suppressors
(silencers) and compensators. The solution is agitated by the bubbling action
of the hydrogen peroxide, and the main reaction is the dissolution of lead
deposits within the suppressor by the acetic acid, which forms lead acetate.
Because of its high toxicity, this chemical solution must be appropriately
disposed by a chemical processing facility or hazardous materials centre.
Alternatively, the solution may be reacted with sulfuric acid to precipitate
nearly insoluble lead(II) sulfate. The solid may then be removed by mechanical
filtration and is safer to dispose of than aqueous lead acetate.
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References:
https://en.wikipedia.org/wiki/Lead(II)_acetate
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1470238/
https://www.ncbi.nlm.nih.gov/pubmed/9114341
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