Lead dissolved

Lead dissolves only very slowly in hot concentrated sodium hydroxide and forms hexahydroxoplumbate(II) ... 

Acid Oxidation. Reactions of lead with acid and alkaUes are varied. Nitric acid, the best solvent for lead, forms lead nitrate acetic acid forms soluble lead acetate in the presence of oxygen sulfuric acid forms insoluble lead sulfate. Sulfuric acid is stored in containers with chemical or acid-grade lead. Lead dissolves slowly in HCl, but in the presence of aqueous alkaUes forms soluble plumbites and plumbates. 

Metals less noble than copper, such as iron, nickel, and lead, dissolve from the anode. The lead precipitates as lead sulfate in the slimes. Other impurities such as arsenic, antimony, and bismuth remain partiy as insoluble compounds in the slimes and partiy as soluble complexes in the electrolyte. Precious metals, such as gold and silver, remain as metals in the anode slimes. The bulk of the slimes consist of particles of copper falling from the anode, and insoluble sulfides, selenides, or teUurides. These slimes are processed further for the recovery of the various constituents. Metals less noble than copper do not deposit but accumulate in solution. This requires periodic purification of the electrolyte to remove nickel sulfate, arsenic, and other impurities. 

What are these compositions Well, if the alloy is at a temperature T, the two phases (obviously) are at this temperature. Consider a Sn-20 at% Pb alloy, at 150°C. Figure A1.13 shows that, at this temperature, tin dissolves 1 at% of lead and lead dissolves 17 at% of tin. The compositions are shown as Xs on the 150°C isotherm (horizontal line) they are the equilibrium phases at 150°C. The line joining them is called a tie line. 

This reaction is faster in dilute nitric acid than strong acid. Hydrochloric acid has little effect on the metal. At ordinary temperatures, lead dissolves slowly in hydrochloric acid, forming a coating of lead(II) chloride, PbCL over the metal, which prevents further attack. 

Lead dissolves in alkalies forming plumbite ion, Pb(OH)42 with the evolution of hydrogen ... 

In C. E. Acker s process (1898), now abandoned,47 sodium chloride was electrolyzed in a cell in which molten lead was used as cathode, and a carbon rod as anode. During the electrolysis, the molten lead dissolved the sodium forming an alloy the chlorine was drawn off from the anodes. The alloy of lead and sodium was decomposed by steam to form hydrogen and sodium hydroxide. 

Preparation of Lead by Displacement with Zinc. Pour several millilitres of a lead acetate solution into a test tube and lower a zinc plate into it. What is observed Write the equation of the reaction. In which acids does lead dissolve best of all ... 

Basic Lead Carbonate (White Lead). Dissolve 1 g of lead acetate in 6 ml of water, introduce 0.5 g of lead(II) oxide into the solution in small portions while stirring it, and heat the mixture. What happens ... 

Copper, Zinc, and Lead. — Dissolve 1 gm. of powdered iron in 25 cc. of nitric acid, assisting solution by heating the mixture to boiling. Dilute the solution with 25 cc. of water, add 80 ec. of ammonia water, and filter. The filtrate should not have a blue color nor should it show any change on the addition of hydrogen sulphide water. 

Lead nithopluiuhaie, Pb-PbOj, ted lead, is similarly described ns a sail, in Ihi.s ease an orihoplumbalc of divalent lead. Pb PbO i. because on treatment with nitric acid, two-thirds of the lead dissolves and one third remains us PbO . It is prepared in the red farm by atmospheric heating of PbO. and in a black form by reaction nl" pbO with pure oxygen. Red lead is formed of PhOj, octahedra (with one common edge I linked by lead atoms covalently bonded to three oxygen atoms. 

Ethoxyphenyl Methyl Tellurium Dichloride3 A two-necked, 250 ml flask is fitted with a dropping funnel and a magnetic stirrer. A solution of 1.06 g (3 mmol) of 4-ethoxyphenyl tellurium trichloride in 75 ml of toluene is placed in the nitrogen-flushed flask. 0.80 g (3 mmol) of tetramethyl lead dissolved in 20 ml of toluene are added dropwise to the stirred solution of the tellurium compound. The mixture is stirred overnight, then filtered, and the solvent distilled from the filtrate. The residue is recrystallized from absolute methanol yield 0.75 g (75%) m.p. 95°. ... 

In 1858 Schonbem noticed that when many substances were exposed to atmospheric oxidation, the oxidisable material appeared to combine with half a molecule of oxygen, leaving the other half in the form of hydrogen peroxide or ozone. This is well exemplified by the corrosion of many non-ferrous metals, such as lead and zinc. When lead, mixed with mercury, is shaken with dilute sulphuric acid in the presence of air or oxygen, lead sulphate is formed, together with some hydrogen peroxide. The amount of the latter is readily ascertained by titration of a portion of the liquid with permanganate, and the quantity of sulphuric acid involved is estimated by titration with alkali. It is then found that the amount of peroxide formed is equivalent to that of the lead dissolved. Thus... 

An alloy with zinc was also prepared by Deville and Debray, which yielded hexagonal prisms, and was combustible in air with feeble deflagration. Its composition was not determined. Ruthenium dissolves in lead, but yields no compound with it. On treatment with acid the lead dissolves, leaving the ruthenium as a crystalline residue.2... 

Lead dissolves in liquid ammonia solutions of sodium giving a highly coloured liquid. The formation of pol) plumbides has been demonstrated by electrometrically titrating a solution of sodium in ammonia with one of lead iodide in ammonia the compounds formed are Na Pb and Na Pbg. The electrolysis of such a solution releases Na at the cathode and Pb at the anode. Evaporation gives [Na(NH3) ]4Pbg which loses NHg to leave pyrophoric Na Pbg. These compounds seem to possess a character between that of a true valency compound and an intermediate phase (Zintl, 1929),... 

To Beodorizo Benzine. Shako rcpoatedlv witli phunbato of soda (oxide of lead dissolved in caustic sinla), and rectify. Tho following plan is. aid to be better Sbako repeatedly with fresh portions of metallio quicksilver let stand for 2 day.s and i cctify,... 

Lotion of Acetate of Lead. Dissolve sugar of lead, i ounce avoirdupois, in distilled or soft water, 1 Imperial pint. Sometimes a little vinegar is added, a like quantity of water being omitted. IJsed in excoriations, bums, sprams, contusions, c. also as an occasional cosmetic wash by persons troubled with emptions. 

Germanium is somewhat more reactive than silicon and dissolves in concentrated sulfuric and nitric acids. Tin and lead dissolve in several acids and are rapidly attacked by halogens. They are slowly attacked by cold alkali, rapidly by hot, to form stannates and plumbites. Lead often appears to be much more noble and unreactive than would be indicated by its standard potential of —0.13 V. This low reactivity can be attributed to a high overvoltage for hydrogen and also in some cases to insoluble surface coatings. Thus lead is not dissolved by dilute sulfuric and concentrated hydrochloric acids. 

Is formed when solution of hypochlorite of soda is added to protoxide of lead dissolved in caustic soda. It is a reddish yellow insoluble powder, resolved by acids into protoxide and oxygen. 

Lead dissolves in alkaline medium, although its solubility rate is low. Lead does not interact with either nitrogen or carbon. Lead resistance to chlorine exceeds that of Al, Cu and Fe up to 300°C, because lead chloride exhibits protective properties. Interaction of lead with... 

In electrochemical cells without liquid junctions, the two electrodes are in contact with the same electrolyte of uniform concentration. For example, the cell shown in Figure 2.23 is made of a lead electrode and a lead amalgam electrode (lead dissolved in mercury), in contact with an aqueous solution of PbCl2. This cell corresponds to the schematic representation (2.123), where M and M" refer to the metal of the two conductors attached to the voltmeter. 

Henry found that lead dissolves in water impregnated with nitrous air (nitric oxide), investigated the effect of fixed air (carbon dioxide) on plants, and the preservation of sea water from putrefaction by quicklime. He published on the advantages of literature and philosophy, on magnesia, and on fermentation (including a substitute for yeast), He published Memoirs of Albert de Haller Warrington, 1783 (price 2S. 6d.). Some of Henry s writings were collected and published (price 2S. 6d.) as ... 

Case 1. Suppose we have diffusion of a solute across a sharp boundary at a = 0 from a solution into a solvent. The solute may be a salt dissolved in water it may be radioactive lead dissolved in lead diffusing into pure lead or it may be an ion in an ionic lattice diffusing into another lattice, e.g. silver diffusing from silver sulphide into copper sulphide, while copper passes in the opposite direction. For the equation (34) to hold we know that D must not be a function of C and that the amounts of solution and solvent must be great enough, the diffusion slow enough, or the time short enough, so that no appreciable amount of solute diffuses from the far extremity of the solution, or reaches the far extremity of the solvent (Fig. 1). In these systems, at = 0, (7 = Cq for x< 0, (7 = 0... 

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