Lead hydroxide

The white precipitate of lead hydroxide (or hydrated lead(ll) oxide) is then oxidised by the chloraie(I) lo the brown dioxide ... 

Prepare a solution of sodium plumbite by adding 10 per cent, sodium hydroxide solution to a few drops of about N lead acetate solution until the white precipitate of lead hydroxide initially formed just redissolves to a clear solution. Add 1 ml. of the fusion solution the presence of sulphiu- is indicated by a black precipitate of lead sulphide. 

Lead glance Lead glass Lead heat stabilizers Lead hydrogen arsenate Lead hydroxide... 

PbF2 is readily prepared by the action of hydrogen fluoride on lead hydroxide, lead carbonate, or a-lead oxide. It can also be obtained by precipitation from lead nitrate or lead acetate solutions using potassium fluoride, ammonium fluoride, or ammonium bifluoride. 

Lead Fluoride. Lead difluoiide, Pbp2, is a white oithorhombic salt to about 220°C where it is transformed into the cubic form some physical properties ate given in Table 1. Lead fluoride is soluble in nitric acid and insoluble in acetone and ammonia. It is formed by the action of hydrofluoric acid on lead hydroxide or carbonate, or by the reaction between potassium fluoride and lead nitrate. 

Lead Hydroxide. Lead hydroxide [19781-14-3] Pb(OH)2, mol wt 241.23, starts to dehydrate at about 130°C, and decomposes to lead... 

The resulting -aminocaproic acid hydrochloride is treated in a manner similar to that used in the preparation of df-alanine (Org. Syn. Coll. Vol. i, 20). The hydrochloride is dissolved in r 1. of water in a 1.5-I. beaker and treated successively with 50 g. of powdered litharge, 25 g. of powdered litharge, 5 g. of freshly precipitated lead hydroxide, 25 g. of powdered silver oxide (Note 2), and finally hydrogen sulfide. During this procedure, the original volume is maintained by the addition of small amounts of water. 

The synthesis of 6-methyluracil from ethyl acetoacetate and urea was described first by Behrend.i The substance has been obtained also by the action of lead hydroxide on methylthiouracil in an alkaline medium, and by boiling benzalmethylhydroxypyri-midinhydrazine with hydrochloric acid. ... 

Lead hydroxide Litliimn amide Methyl ethyl pyridine Sodamide Sodium cyanide Nitrogen dioxide Nitric acid... 

It has been found that red lead, litharge and certain grades of metallic lead powder render water alkaline and inhibitive this observation has been confirmed by Pryor . The effect is probably due to a lead compound, e.g. lead hydroxide, in solution. Since, however, atmospheric carbon dioxide converts these lead compounds into insoluble basic lead carbonate, thereby removing the inhibitive materials from solution, these pigments may have only limited inhibitive properties in the absence of soap formation. 

Work by Beckmann indicated that lead hydroxide was only very slightly better as an inhibitor than sodium hydroxide, and the mechanism... 

Lead forms two types of chemical compounds lead (II), and lead (IV) compounds based on Pb24 and Pb4 ions, where those based on Pb2 ions are the more stable. The metal is oxidized even at room temperature to lead oxide (PbO) and also by water that contains oxygen and forms lead hydroxide (Pb(OH),). In the lead-acid battery, the (less stable) lead (IV) oxide (lead dioxide, Pb02), is of greatest importance. Beside these two, a number of oxides are observed in the battery that are mostly mixtures. A brief survey will now be given of those compounds that are of interest for lead-acid batteries. 

Switzerland, and prepared according to a literature procedure, were used by the submitters without any noticeable difference. Lead tetraacetate was dried prior to use for at least 12 hours over potassium hydroxide and phosphorus pentoxide in an evacuated desiccator (12 mm.) that was protected from direct light. If well protected from moisture, lead tetraacetate can be kept for weeks in this way. However, after exposure to moisture in the air, lead tetraacetate usually turns brown from hydrolysis to lead hydroxide. The reactivity of such lead tetraacetate is diminished somewhat, but it can still be used. If the lead tetraacetate has turned black, the reagent should be recrystallized from glacial acetic acid and dried prior to use as described above. 

A significant fraction of lead carried by river water is expected to be in an undissolved form, which can consist of colloidal particles or larger undissolved particles of lead carbonate, lead oxide, lead hydroxide, or other lead compounds incorporated in other components of surface particulate matters from runoff. Lead may occur either as sorbed ions or surface coatings on sediment mineral particles, or it may be carried as a part of suspended living or nonliving organic matter in water. The ratio of lead in suspended solids to lead in dissolved form has been found to vary from 4 1 in rural streams to 27 1 in urban streams (Getzetal. 1977). 

Lead carbonate-lead hydroxide (Basic lead carbonate)... 

Lactamide, 21, 71 Laurel wax, 20, 68 Lauryl alcohol, 20, 50 Laurylisothiuronium bromide, 21,37 Lauryl mercaptan, 21, 36 Lauryl -toluenesclfonate, 20, 50 Lead dioxide, 21, 1 Lead hydroxide, 22,15 Lead tetraacetate, 21, 1, 3 dl-Leucine, 21, 74 Linoleic acid, 22, 73 tetrabromide, 22, 76 Linolenic acid, 22, 82 hexabromide, 22, 82, 85 Linolic acid, 22, 73... 

Prause et al. 1985). At pH 6.5 and water alkalinity of 25 mg CaC03/L, elemental Pb+2 is soluble to 330 pg/L however, Pb+2 under the same conditions is soluble to 1000 pg/L (Demayo et al. 1982). In acidic waters, the common forms of dissolved lead are salts of PbS04 and PbCl4, ionic lead, cationic forms of lead hydroxide, and (to a lesser extent) the ordinary hydroxide Pb(OH)2. In alkaline waters, common species include the anionic forms of lead carbonate and hydroxide, and the hydroxide species present in acidic waters (NRCC 1973). Unfortunately, the little direct information available about the speciation of lead in natural aqueous solutions has seriously limited our understanding of lead transport and removal mechanisms (Nriagu 1978a). 

Bischof An obsolete process for making white lead (basic lead carbonate), invented by G. Bischof around 1900. Lead monoxide was reduced by the carbon monoxide in water-gas to form black lead suboxide, oxidized in damp air to lead hydroxide, slurried in dilute acetic acid, and carbonated with carbon dioxide. Piloted in Willsden, London, and commercialized by L. Mond in the Brimsdown White Lead Company. A sample of Bischof s white lead was used by Holman Hunt in his painting Light of the World, now in St. Paul s Cathedral, London. 

Several of the inorganic bases have been involved in various laboratory or industrial scale incidents, individual entries being t Ammonia, 4497 Ammonium hydroxide, 4544 Barium hydroxide, 0208 Caesium amide, 4260 Calcium carbonate, 0317 Calcium hydroxide, 3928 Calcium oxide, 3937 Lead carbonate-lead hydroxide, 0726 Lithium carbonate, 0533 Magnesiiun carbonate hydroxide, 0534 Magnesiiun oxide, 4695 Potassiiun carbonate, 0531 Potassimn hydroxide, 4428 Sodimn carbonate, 0552 Sodium hydroxide, 4445 Sodimn oxide, 4802... 

Alanine.—After the glycine has been removed as above described, the alanine is obtained by crystallisation after removal of the hydrochloric acid by boiling with lead hydroxide. 

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