Neutral lead acetate

Chemical Designations - Syiwnyms Lead acetate trihydrate Neutral lead acetate Normal lead acetate Salt of Saturn Sugar of lead Chemical Formula Pb(C2H30i)2-3H20. 

Solution of basic lead acetate An amount of 23 g of neutral lead acetate, Pb (CH COO)2,3HjO, was mixed with 70 mL of water and then boiled. Twelve grams of lead oxide, PbO, was added to this solution. The precipitate was filtered off... 

Synonyms lead(II) acetate plumbous acetate normal lead acetate neutral lead acetate sugar of lead... 

Synonym Neatsfoot Oil Necatorina Nechexane Neutral Ahhonium Pluoride Neutral Anhydrous Calcium Hypochlorite Neutral Lead Acetate Neutral Nicotine Sulfate Neutral Potassium Chromate Neutral Sodium Chromatetanhydrous Neutral Verdigris Nickel Acetate Nickel Acetate Tetrahyorate Nickel Ammonium Sulfate Nickel Ammonium Sulfate Hexahydrate Nickel Bromide Nickel Bromide Trihydrate Nickel Carbonyl Nickel Chloride Nickel Chloride Nickel Cyanide Nickel Iiu Fluoborate Nickel Fluoroborate Solution Nickel Fluoroborate Nickel Formate Nickel Formate Dihyorate Nickel Nitrate Nickel Nitrate Hexahydrate Nickel Sulfate Nickel Tetracarbokyl Nickelous Acetate Nickelous Sulfate Nicotine Nicotine Sulfate Nifos Nitralin Nitram O-Nitraniline P-Nitraniline Nitric Acid Nitric Acid, Aluminum Salt Nitric Acid, Iron (111) Salt Compound Name Oil Neatsfoot Carbon Tetrachloride Neohexane Ammonium Fluoride Calcium Hypochlorite Lead Acetate Nicotine Sulfate Potassium Chromate Sodium Chromate Copper Acetate Nickel Acetate Nickel Acetate Nickel Ammonium Sulfate Nickel Ammonium Sulfate Nickel Bromide Nickel Bromide Nickel Carbonyl Nickel Chloride Nickel Chloride Nickel Cyanide Nickel Fluoroborate Nickel Fluoroborate Nickel Fluoroborate Nickel Formate Nickel Formate Nickel Nitrate Nickel Nitrate Nickel Sulfate Nickel Carbonyl Nickel Acetate Nickel Sulfate Nicotine Nicotine Sulfate Tetraethyl Pyrophosphate Nitralin Ammonium Nitrate 2-Nitroaniline 4-Nitroaniline Nitric Acid Aluminum Nitrate Ferric Nitrate... 

Lead salt, PbC2H2N202, amor ppt prepd by treating an ice-cold aq soln of disodium diformylhydrazine with neutral lead acetate... 

Properties—Caramel is found in commerce as a concentrated solution or in solid masses or in powder as coffee essence. The solid forms an amorphous, reddish brown, brittle mass which is porous aud highly deliquescent. It is completely soluble in water and partly soluble in alcohol. It has a bitter taste due to the presence of assamar, and is not fermented by yeast. Its melting-point is about 135° C. It reduces the salts of the heavy metals and is precipitated from aqueous solutions by baryta and by neutral lead acetate, as well as by paraldehyde in alcoholic solution. 

Antineuritic Factor Kinnersly and Peters86 studied methods for concentrating thiamine (torulin) an antineuritic factor present in yeast. In one procedure, neutral lead acetate is added to an aqueous yeast extract to precipitate certain impurities. The filtrate is treated with barium hydroxide to precipitate gums—the excess barium hydroxide being removed with sulfuric acid. Other impurities are removed from the solution with mercuric sulfate. Activated carbon is added to the filtrate to adsorb the active principle which is subsequently extracted with 0.1 N hydrochloric acid in 50% alcohol. 

Lead Acetate. Neutral Lead acetate normal lead... 

Acetates.—Neutral Lead Acetate—Salt of Saturn—Sugar of Lead—Plumbi acetas (U.S. Br.)—Pb(CaH Oa)a-l-SAq—334.9-1-34—is formed by dissolving PbO in acetic acid or by exposing Pb in contact with acetic acid to air. 

The presence of leucin and tyrosin in the urine may be detected as follows the freshly collected urine is treated with basic lead acetat filtered, the filtrate treated with HaS, filtered from the precipitated lead sulfid, and the filtrate evaporated over the water-bath leucin and tyrosin crystallize they may be separated by extraction of the residue with hot alcohol, which dissolves the leucin and leaves the tyrosin. The leucin left by evaporation of the alcoholic solution may be recognized by its crystalline form and by the following characters (1) a small portion is moistened on platinum foil with HNOa, which is then cautiously evaporated a colorless residue remains, which, when warmed with caustic soda solution, turns yeUow or brown, and by further concentration is converted into oily drops, which do not adhere to the platinum (Scherer s test) (2) a portion of the residue is heated in a dry test-tube it melts into oily drops, and the odor ofainylamin (odor of ammonia combined with that of fusel oil) is observed (3) if a boiling mixture of leucin and solution of neutral lead acetate be carefully neutralized with ammonia, brilliant crystals of a compound of leucin and lead oxid separate (4) leucin carefully heated in a glass tube, open at both ends, to 170° (338° F.), sublimes without fusing, and condenses in flocculent shreds. If heated beyond 180° (356° F.), the decomposition mentioned in (2) occurs. 

The taurocholates are neutral in reaction those of the alkaline metals are soluble in alcohol and in water and by long contact with ether they assume the crystalline form. They may be separated from the glycocholates in watery solution, either <1) by dilute HaSOa in the presence of a small quantity of ether, which precipitates glyeocholic acid alone or (2) by adding neutral lead acetate to the solution of the mixed salts (which must be neutral in reaction) lead glycocholate is precipitated and separated by filtration. To the mother liquor basic lead acetate and ammonia are added, when lead taurocholate is precipitated. The acids are obtained from the hot alcoholic solutions of the Pb salts by decomposition with HaS, filtration, concentration, and precipitation by ether. 

A number of reagents in solution give precipitates or heavy jellies on addition to gum arabic solutions borax, ferric chloride (excess redissolved), basic lead acetate (but not neutral lead acetate), potassium and sodium silicates, gelatin, Millon s reagent (12) and Stokes s acid mercuric nitrate reagent (12), Dilute acids hy-... 

Neutral lead acetate (20% solution) Basie lead acetate (AOA(3) Potassium hydroxide (10% soln.) Neutral ferric chloride (5% soln.) Alcohol... 

The above substitutes for the iodometric determination with one or two exceptions have not been tested for specificity for free SO2. Mathers (1949) on the basis of the fact that free sulfur dioxide is removed early in the distillation of wine proposed that 10 ml. of the distillate from the alcohol determination be mixed with 0.5 ml. of 5% neutral lead acetate and the turbidity of the suspension formed be used to correct volatile acidity for sulfur dioxide. La Rosa (1950) assumed that the color formed on mixing the fuchsin-sulfuric acid-formaldehyde reagent with white wine was a measure of free SO2 but did not give any data to confirm this. The fuchsin procedure and the lead sulfite procedures are very sensitive, the former more so, and can be applied only to very small aliquots or to dilute solutions. 

Freshly pressed yeast is extracted by boiling twice with one-and-one-half times the amount of water, containing 0.1 % acetic acid. Some neutral lead acetate is added to the filtrate and then a 10% solution of mercuric sulfate in 5 % aqueous sulfuric acid. After decomposition of the Hg salt with H,S and removal of the excess H,S by a stream of an inert gas the solution is made 0.5 N with sulfuric acid and reprecipitated with CujO. This process precipitates GSH as a colorless crystalline copper salt. The decomposition with H,S yields 1 to 1.2 gm. of GSH from 1 kg. yeast. A method of isolation using the S-benzyl derivative has been published in 1941 (9). A Japanese patent (10) claims a fourfold yield after incubation of the yeast with cysteine and malt extract for 8 hours. 

According to the conditions, hexose monophosphate and trehalose phosphate also accumulate in varying amounts. Separation of the fructose diphosphate from the monophosphate can be effected by precipitating the diphosphate with neutral lead acetate or barium ions, followed by precipitation of the monophosphate from the supernatant liquid with basic lead acetate or barium ions in 50% or stronger ethanol (199). The separation of the different monophosphates was carried out by fractional crystallization (200). Chromatographic methods have also been used (Chapter XI). 

Neutral Ahhonium Pluoride Neutral Anhydrous Calcium Hypochlcrite Neutral Lead Acetate Neutral Nicotine Sulfate Neutral Potassium Chromate Neutral Sodium Chromatetanhydrous Neutral Verdigris Nickel Acetate... 

Riffault et al. (1874) describe a while anlimoniale of lead , the preparation being to mix one part antimony sulfide (stibnite,. v.) with five parts potassium nitrate, this being heated to red hot the product is dissolved in water and a neutral lead acetate solution added. Essentially the same recipe occurs in the text by Bersch (1901), who describes this and lead antimonite as heavy, white powder... dearer than while lead [. v.], to which [it] is inferior in covering power, and which [it does] not exceed in permanence . The precise chemical composition seems to be currently unknown. See also lead antimonite. 

Finally, nineteendi century European sources - such as Riffault et al. (1874) - mention its use, describing the preparation of basic lead chloride for use as apigment from a solution of neutral lead acetate precipitated with lydrochloric acid, then treated with basic lead acetate until it has become basic . The precipitated pigment was then washed and dried. 

Glutathione may be obtained by the rapid extraction of pressed baker s yeast with 0 1 per cent, acetic acid, and subsequent precipitation with neutral lead acetate followed by mercuric sulphate. After removal of the metals by H S, the peptide is selectively precipitated by addition of cuprous oxide (Hopkins, 1929). The tissue content of glutathione may be estimated by titrating with 0 001 N iodine, the solution that is obtained by exhaustive extraction of the material with 10 per cent, trichloracetic acid until the extract no longer gives a violet colour with nitroprusside and ammonia. The method is not specific, any other labile thiol compound reacts in a similar fashion. 

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