Cupric sulfide

Cupri-. cupric, copper(II). -azetst, n. cupric acetate, copper(II) acetate, -carbonat, n. cupric carbonate, copper(II) carbonate, -chlorid, n. cupric chloride, copper(II) chloride. -hydroxyd, n. cupric hydroxide, cop-per(II) hydroxide. -ion, n. cupric ion, copper(II) ion. -ozalat, n. cupric oxalate, copper(II) oxalate, -oxyd, n. cupric oxide, copper(II) oxide. -salz, n. cupric salt, copper(II) salt, -suifat, n. cupric sulfate. copper(II) sulfate, -sulfid, n. cupric sulfide, copper(II) sulfide, -verbihdung, /. cupric compound, copper(II) compound, -wein-saure, /. cupritartaric acid. 

What about the state of equilibrium for the reaction represented by equation (11)1 Let us place a strip of metallic copper in a zinc sulfate solution. No visible reaction occurs and attempts to detect the presence of cupric ion by adding H2S to produce the black color of cupric sulfide, CuS, fail. Cupric sulfide has such low solubility that this is an extremely sensitive test, yet the amount of Cu+2 formed cannot be detected. Apparently the state of equilibrium for the reaction (11) greatly favors the products over the reactants. 

Cupric sulfide, copper(II) sulfide, reacts with hot nitric acid to produce nitric oxide gas, NO, and elemental sulfur. Only the oxidation numbers of S and N change. Write the balanced equation for the reaction. 

Cupric sulfide, CuS, occurring as the mineral covellite (also known as covelline), exhibits a very unusual structure, in which the Cu is again partly 3-coordinate and partly 4-coordinate, with two-thirds of the sulfur atoms existing as S2 groups like those in pyrites. The low-temperature form of CuSe has also a covellite structure, the high-temperature modification (P-CuSe) being orthorhombic. All CuX2 compounds assume pyrite-type structures. 

Chiu prepared monodisperse crystalline particles of metal sulfides, such as lead sulfide (PbS cubes 100 A) (I), cupric sulfide (CuS hexagonal bipyramids 200 A) (2), and zinc sulfide (ZnS multifaceted spheres 0.1-0.4 p,m) (3) by introducing hydrogen sulfide gas into dilute acidic solutions of the ethylenediamine tetraacetic acid (EDTA) complexes of the corresponding metal ions (10 4-10-1 mol dm-3) for several minutes at room temperature. 

In cupric sulfide systems, a high stability constant of a chelate does not necessarily mean a slow release of metal ions, due to the extremely high rates in both association and dissociation of the chelate. For instance, the reactions of chelates, Cu(TMD)22+ and Cu(DETA)22+, with TAA under standard conditions A finish within 2 min at 25°C to yield rather small CuS particles of 40 to 50 nm, despite the respective high stability constants, 10169 and 102l comparable to or even much higher than the stability constants of EDTA chelates of the other kinds of metal ions, such as Cd2+, Zn2+, and Pb2+, which are much slower in releasing these metal... 

In heavily sulfited white wines containing over 0.5 ppm copper and stored in sealed containers, a reddish-brown deposit may form. This occurs in the absence of oxygen and ferric ions but redissolves readily upon exposure to oxygen. Its formation may be accelerated by exposure to sunlight or heat, and it is believed to consist of colloidal cupric sulfide (14, 29). More commonly, copper casse may arise from reactions between copper and sulfur-containing amino acids, peptides, and proteins (15,16,17). 

WITH HYDROGEN SULFIDE, BROWNISH-BLACK PRECIPITATE OF CUPRIC SULFIDE. 

Write the chemical formulas for (a) cupric sulfide ib) stannous fluoride (c) plumbous chloride id) ferric iodide (e) auric nitrate if ) mercuric sulfide. 

A sample of an alloy of aluminum and cofiper weighing 1.000 g was dissolved in acid, the solution was saturated with hydrogen sulfide and filtered, and the precipitate, consisting of cupric sulfide, CuS, was dried and weighed. It was found to w eigh 95.5 mg. What was the percentage ol copper in the alloy ... 

Derivation By heating cupric sulfide in a stream of hydrogen. 

The absorption of copper from the bowel can be influenced by a number of inorganic substances. Anions, which have a tendency to form highly insoluble salts with copper under the conditions prevailing in bowel contents, tend to reduce the absorption of copper. Sulfide is the best known of these. Cupric sulfide is poorly absorbed by rats and pigs (B21, S23). Addition of sulfides to the diet markedly reduces copper absorption in animals (D5) and man (C5). Of the cations, molybdenum is known to influence copper retention in animals. It is suspected that molybdenum influences the membrane transport of copper in such a way that absorption is decreased and excretion increased (D6). For details of this problem the reader is referred to Underwood s monograph (U2) and a recent review by Mills (M25). Problems of this nature have not yet been encountered in man. Oral doses of potassium sulfide and certain ion-exchange resins are used to reduce the absorption of copper in certain pathological conditions in man (C5). 

Copper is easily extracted with 5% sulfuric acid from the ores containing cupric hydroxide, cupric carbonate, and cupric oxide such as azurite, malachite, and teno-rite. However, copper is seldom extracted with sulfuric acid from copper ores containing cupric sulfides the presence of ferric ion is mandatory to extract copper with sulfuric acid from the ores, e.g., chalcopyrite [FeCuS2]. 

Grozdanov et al. [18, 49, 50] report a direct relation between the TS concentration and the final compound composition. Low concentrations tend to form cuprous sulfide and high ones tend to form cupric sulfide (CuS). It is possible that in the first case the reduction of cupric ions preceeds the deposition step. Similar effects may occur in the tin sulfide system. Engelken et al. [64] report the formation of SnxS with some variations in x using S dissolved in propionic acid as the sulfur precusor in this study the solution was non-aqueous which is rather rare in CBD studies. 

Cupric Sulfide. CuS mol wt 95.61. Cu 66.46%, S 11.54%. Occurs in nature as the mineral corellile, or indigo copper (blue, hexagonal or monoclinic crystals). Prepn Glemser, Sauer in Handbook of Preparative Inorganic Chemistry, vol. 2, C. Brauer, Ed. (Academic Press, New York, 2nd ed., 1965) p 1017. 

Cupric Sulfid—CuS—93.2—is formed by the action of HsS, or of XH4HS, on solutions of cupric salts. It is almost black when moist, greenish-brown when dry. Hot HXO3 oxidizes it to Cu SO4 hot HCl converts it into CuCU, with separation of S, and formation of H S. It is sparingly soluble in NH4HS, its solubility being increased by the presence of organic matter. 

Alternate methods a) Cupric sulfide is heated in vacuum to the melting point of cuprous sulfide. The reaction is preferably... 

Some anions, particularly ones that are more polarizable, may impart a covalent character to the compound and produce color. The sulfide ion, colorless in simple Group I salts such as Na2S, produces considerable covalent character in combination with the heavier and more polarizable transition metals, such as in yellow grenockite (CdS) and reddish acanthite (Ag2S), as well as in the cuprous and cupric sulfides mentioned above. 

Over the years, several different battery technologies have been tried. Including mercury-zinc, rechargeable silver-modified-mercuric-oxide-zinc, rechargeable nickel-cadmium, radioactive plutonium or promethium, and lithium with a variety of different cathodes. Lithium-cupric-sulfide and... 

Cupric sulfide kyii-prink (1799) adj. See copper blue. 

Consequently, a suspension of copper sulfide is completely clarified by cyanides. This fact may be used to detect cyanides even in the presence of ferrocyanides, ferricyanides, iodides, bromides, chlorides, and thiocyanates. The test may be made on paper impregnated with cupric sulfide the sensitivity is greater. 

The phenolphthalin method for the determination of cyanide has been modified and adapted to a continuous flow system based on the flow-injection principle [39]. Aqueous cyanide samples are injected into a carrier stream (0.001 M NaOFI), which is then merged with the combined reagent stream of phenolphthalein and ceirbonate buffer (pH 10.3), and the mixture is passed through an online cupric sulfide packed column. The resulting... 

Haj-Hussein reported a SPR-FIA system for indirect determination of cyanide based on the formation of a soluble cupro-cyanide complex in a small column packed with cupric sulfide [47], Solid-phase reactors filled with silver iodide [48] and cadmimn carbonate [49] have been used for the indirect determination of cyanide. 

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