Calcium carbide salts

Calcium carbide is the calcium salt of the doubly negative carbide ion (C=C ) Car bide ion is strongly basic and reacts with water to form acetylene... 

Because of its high reactivity, production of barium by such processes as electrolysis of barium compound solution or high temperature carbon reduction is impossible. Electrolysis of an aqueous barium solution yields Ba(OH)2, whereas carbon reduction of an ore such as BaO produces barium carbide [50813-65-5] BaC2, which is analogous to calcium carbide (see Carbides). Attempts to produce barium by electrolysis of molten barium salts, usually BaCl25 met with only limited success (14), perhaps because of the solubiUty of Ba in BaCl2 (1 )-... 

Methods of EGA using selective sorption, condensation of effluent gases, infrared absorption and thermoparticulate analysis have been reviewed by Lodding [144]. The use of simple gas burette systems should not be forgotten and an Orsat gas analysis apparatus can provide useful measurements in studies of the decomposition of formates [169]. Problems have been encountered in the determination of water released Kiss et al. [170—172] have measured the formation of this compound from infrared analyses of the acetylene evolved following reaction of water with calcium carbide. Kinetic data may be obtained by wet methods ammonia, determined by titration after absorption in an aqueous solution, has been used to measure a—time values for the decomposition of ammonium salts in a fluidized bed [173],... 

The feasibility of strategies B and C has been demonstrated particularly for the synthesis of the so-called pericyclinosilanes (previously also named cyclo-silethynes [20]) 70-72 (Fig. 3). Historically, an approach of type C was the first one ever, in that [4]pericyclinosilane 70 was prepared by simple pyrolysis of a mixture of calcium carbide and dichlorodimethylsilane in a molten salt mixture of KCl/NaCl at 400°C, albeit in low yield (actual yield not reported) [21]. A... 

Thus, all copper salts give an explosive reaction with calcium carbide. This is due to the formation of explosive copper acetylide, which is formed from cupric or cuprous cation and the acetylene formed. 

Catalytic forms of copper, mercury and silver acetylides, supported on alumina, carbon or silica and used for polymerisation of alkanes, are relatively stable [3], In contact with acetylene, silver and mercury salts will also give explosive acetylides, the mercury derivatives being complex [4], Many of the metal acetylides react violently with oxidants. Impact sensitivities of the dry copper derivatives of acetylene, buten-3-yne and l,3-hexadien-5-yne were determined as 2.4, 2.4 and 4.0 kg m, respectively. The copper derivative of a polyacetylene mixture generated by low-temperature polymerisation of acetylene detonated under 1.2 kg m impact. Sensitivities were much lower for the moist compounds [5], Explosive copper and silver derivatives give non-explosive complexes with trimethyl-, tributyl- or triphenyl-phosphine [6], Formation of silver acetylide on silver-containing solders needs higher acetylene and ammonia concentrations than for formation of copper acetylide. Acetylides are always formed on brass and copper or on silver-containing solders in an atmosphere of acetylene derived from calcium carbide (and which contains traces of phosphine). Silver acetylide is a more efficient explosion initiator than copper acetylide [7],... 

Thermal reduction processes are not being practiced anywhere in the world at present for large-scale production of sodium. Such methods, however, can he conveniently adapted for laboratory preparation of metalhc sodium. Sodium can be prepared by thermal reduction of its hydroxide, carbonate, or chloride at elevated temperatures. These salts are heated with carbon, calcium carbide, iron carbide, ferrosilicon, or other reducing agents at temperatures above 800°C under vacuum ... 

Calcium carbide. The calcium compound having the formula CaC3 is that which is implied when the common term carbide is used. That is, just as the term salt commonly denotes sodium chloride, so the term carbide is applied to calcium carbide. This compound is formed commercially by the reaction between quicklime and coke in an electric furnace at 2800 to 2900°C ... 

Cyanamide, H2N =N , is a crystalline solid, mp 45 °C, prepared by hydrolysis of its calcium salt, CaNCN, under mild conditions (e.g. aqueous CO2) in order to avoid further hydrolysis of cyanamide. Calcium cyanamide is made on a large industrial scale by a high-temperature reaction of calcium carbide with molecular nitrogen (equation 18). The cyanamide... 

Water can react violently with alkali metals and rapidly with alkaline metals and their oxides, such as calcium oxide and magnesium oxide. Water also reacts with anhydrous salts to form hydrates of various compositions, and with certain organic materials and calcium carbide. 

Cyanamide, H2N Ce=N, is obtained in the form of its calcium salt by the high-temperature reaction between calcium carbide and nitrogen. This reaction is... 

Calcium carbide (CaC2) is an intermediate in the manufacturing of acetylene (C2IT2). It is the calcium salt of the carbide (also called acetylide) ion (C2 ). What is the electron configuration of this molecular ion What is its bond order ... 

Use Chemical (precipitant in the cyanide process, precipitant of iodine and lead salts from their solutions, catalyst, calcium carbide) decolorizing and filtering medium gas adsorbent component of black powder and other explosives fuel arc-light electrodes decolorizing and purifying oils solvent recovery deodorant. 

Bleach (chloride of lime) Bromine Butyl acetate Butyl phthalate Butyric acid Calcium carbide Calcium cyanamide Calcium hypochlorite Calcium nitrate Calcium potassium ferrocyan-ide (double salt)... 

Metal-like and Salt-like Interstitial Compounds. A different type of interstitial lattice structure—that of calcium carbide— is shown in Fig. 87, in which the lace-centred cubic calcium atoms are shown as ), and the interstitial carbon atoms are in groups of two. This type of lattice, in view of its slight vertical distortion, is face-centred tetragonal rather than face-centred cubic, but its most interesting feature is tho fact that here the interstitial carbon a,toms are linked together in groups of two. 

CALCIUM CARBIDE (75-20-7) Contact with water, moist air, steam, alcohols forms explosive acetylene gas, corrosive calcium hydroxide, and heat. Violent reaction with acid, acid fumes, copper salts, strong oxidizers (bromine, chlorine, iodine, etc.), iron trichloride, tin dichloride, silver nitrate. Incompatible with oxidizers, hydrogen chloride, methanol, copper salt solutions, lead fluoride, magnesium, selenium, sodium peroxide, stannous chloride, sulfur. 

LAPIS INFERNALIS (7761-88-8) A powerful oxidizer. Forms friction- and shock-sensitive compounds with many materials, including acetylene, anhydrous ammonia (produces compounds that are explosive when dry), 1,3-butadiyne, buten-3-yne, calcium carbide, dicopper acetylide. Contact with hydrogen peroxide causes violent decomposition to oxygen gas. Violent reaction with chlorine trifluoride, metal powders, nitrous acid, phosphonium iodide, red or yellow phosphorus, sulfur. Incompatible with acetylides, acrylonitrile, alcohols, alkalis, ammonium hydroxide, arsenic, arsenites, bromides, carbonates, carbon materials, chlorides, chlorosulfonic acid, cocaine chloride, hypophosphites, iodides, iodoform, magnesium, methyl acetylene, phosphates, phosphine, salts of antimony or iron, sodium salicylate, tannic acid, tartrates, thiocyanates. Attacks chemically active metals and some plastics, rubber, and coatings. 

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