White lead Pb3

Some basic salts with layer structures are always obtained in a poorly crystalline state. For example, crystals of white lead , Pb3(0H)2(C03)2, are too small and too disordered to give useful X-ray photographs, but from electron diffraction data it is concluded that there are probably Pb(OH)2 layers interleaved with Pb and CO3 ions in a rather disordered structure. ... 

Sour tastes are produced by the hydrogen ions in acids and salty tastes by the anions of salts (for example, chloride ions). Bitterness is due primarily to a class of compounds called alkaloids examples are quinine, caffeine, and nicotine. Many substances other than sugar evoke a sweet taste, including ethylene glycol (antifreeze), alcohols, amino acids, and certain salts of lead and beryllium [for example, lead carbonate hydroxide (white lead), Pb3(0H)2(C03)2]. (The sweet flavors of ethylene glycol and lead paint are blamed for the unwitting consumption of these toxic substances by children and animals.)... 

Basic lead carbonate Basic lead carbonate (2PbC03.Pb(0H)2) Berlin white Carbonic acid, lead salt, basic Ceruse Cerussa C.l. 77597 C.l. pigment white 1 EINECS 215-290-6 Flake lead Halcarb 20 HSDB 5701 Kremser white Lead, bis(carbonato 2-))dihydroxytri- Lead, bis(carbonato)dihydroxytri- Lead carbonate hydroxide (Pb3(0H)2(C03)2) Lead hydroxide carbonate Lead subcarbonate Silver white Trilead bis(carbonate) dihydroxIde White lead White lead, hydrocerussite. Used as a PVC stabilizer. White solid mpn 400° (dec). Halstab. 

Arsenites precipitate from Pb ", bulky, white Pb3(As03)2 aq, difficultly soluble in water, readily soluble in dilute acids and OH . Arsenate precipitates white lead arsenate from neutral or shghtly alkaline Pb°, soluble in OH and HNO3 insoluble in CH3CO2H. It may be a mixture of Pb3(As04>2 and PbHAs04, depending on conditions. 

Lead Orthovanadaie, Pb3(V04)2, is precipitated as a white powder when sodium orthovanadate is treated with lead acetate solution.7... 

Lead Orthoarsenite, Pb3(As03)2, is obtained as a white precipitate on adding a solution of basic lead acetate to a boiling aqueous solution of arsenious oxide,9 or of potassium tetrarsenite,10 or by the action of an alkali plumbite on an alkali arsenite.11 When dried in a dark air oven the arsenite remains white, but when exposed to light some specimens turn brown, a change which has been attributed to reduction of the lead to suboxide,12 but some arsenate and free arsenic are formed. All specimens... 

Disodium hydrogen phosphate white precipitate of lead phosphate 3Pb2+ + 2HP04" Pb3(P04)2 + 2H+... 

Lead Chromicyanide, Pb3[Cr(CN)8l230H2O, is precipitated on the addition of alcohol to a solution of the basic salt in a limited quantity of dilute sulphuric acid. No precipitate is formed when potassium eliromicyanide is added to a solution of lead nitrate, but the basic acetate of lead yields a white precipitate. ... 

The banc compound, Pb3[Cr(CN)gj2.5PbO, is obtained as a yellowish-white amorphous precipitate on adding ammoniacal lead acetate solution to a dilute solution of potassium chromicyanide in absence of carbon dioxide. 

The external surfaces of the used catalyst, as well as the surfaces of the catalyst container, were usually covered with a grayish-white film that x-ray analysis usually indicated was an amorphous compound consisting of Br, Cl, P, Pb, and S. On occasion, this compound was identified as lead bromide phosphate, 3[Pb3(P04)2] PbBr2, 600A crystallite size. Ash and gum deposits were usually found on the upstream (inlet) end of monolithic catalysts they often caused plugging of a small fraction of the flow channels. Analysis of these deposits revealed that they consisted primarily of calcium, zinc, and phosphorus, i.e. they resulted primarily from the consumption of motor oil. 

Lead orthophosphate, Pb3(P04)2, is a white insoluble compound, which, like lead apatite, Pbio(P04)g(OH)2, can be reduced by hydrogen at comparatively low temperatures (4.7). Lead orthophosphate is one of the least soluble lead salts (Table 5.22) and the least soluble orthophosphates (Table 5.12). It exists as monoclinic a-Pb3(P04)2, rhombohedral 3-Pb3(P04)2, or as an apatite-type structure, Pb9(P04)g(0H)2 (Table 5.20). Also known are Pbio(P04)gO, Pb3(P04)2-Pb0 and Pb3(P04)2-5Pb0. 

The ions HP04 and P04 precipitate from lead acetate or nitrate, normal lead phosphate, Pb3(P04)2, white, slightly soluble in CH3CO2H, soluble in HNO3 or OH , converted to Pbty by I" ... 

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