Cupric chloride solutions

The hemispherical electrode may be coupled with a ring [20] to form a rotating ring-hemisphere electrode (RRHSE) as shown as Fig. 9(d). The ability of this combination to detect intermediate reaction products is demonstrated in Fig. 10, where a series of cathodic sweep curves for the reduction of Cu2 + in acidic cupric chloride solution are... 

Cymet (2) [Cyprus Metallurgical] A process for extracting copper from sulfide ores. Copper is leached from the ore using aqueous ferric and cupric chloride solution ... 

Materials Required Proguanil hydrochloride 0.6 g ammoniacal cupric chloride solution (dissolve 22.5 g of copper (II) chloride in 200 ml of DW and mix with 100 ml of 13.5 M ammonia) NO. 4 sintered-glass crucible mixture of dilute solution of ammonia and DW (1 5). 

Theory Gravimetric analysis of proguanil hydrochloride involves the precipitation of the proguanil-cupric complex that results on the addition of ammoniacal cupric chloride solution to a solution of proguanil hydrochloride. The reaction can be expressed by the following equation ... 

The solution is stirred slowly and ca. 25 ml. of 2N cupric chloride solution is added slowly. The blue-green color of the cupric chloride is rapidly discharged and a brick red coloration occurs, followed by the precipitation of voluminous bright red crystals of the cuprous chelate of 2,3-diazabicyclo[2.2.1]hept-2-ene. The pH is adjusted to 5-6 by the addition of 5N ammonium hydroxide. Addition of 25 ml. of the cupric chloride solution followed by neutralization of the generated hydrochloric acid with 5iV ammonium hydroxide is repeated five times. The precipitate is collected by filtration and the filtrate is again treated with 25-ml. portions of cupric chloride solution and 5N ammonium hydroxide. The procedure is repeated until the filtrate is clear red at pH 3-4 and returns to a cloudy green at pH 6 with no further formation of precipitate (Note 5). 

The reactions of acetylene, including its polymerisation, that occur in the presence of cupric chloride solution have been studied 670) in the (additional) presence of biguanide dihydrochloride. This solution has the unique property of promoting the formation of acetic acid from acetylene. 

Arsine reacts with cupric chloride solution to give cupric arsenide. Oxidation with stannic chloride, SnCR, forms hydrogen diarsenide, AS4H2. It reacts with dilute silver nitrate solution forming metallic silver. 

The purity of the gas is tested by explosion analysis (J. C. S., 84, 555) the ratio, contraction on explosion to absorption by baryta water after explosion, should lie between 0-73 and 0-77 (theoretical 0,75). Great care must be taken that this preparation is carried out in the absence of flame, and that neither the apparatus nor the collected gas is exposed to direct sunlight, which decomposes acetylene. Also the cupric chloride solution employed for washing should be kept acid if it becomes alkaline the explosive copper aeetylide is precipitated. Should this occur the solution is mixed with much water and poured away. 

Cupric Chloride Solution Transfer 10.0 g of C uC I2-2I I2O to a 1-L volumetric flask dissolve in and dilute to volume with dimethylformamide (DMF). 

Solution 3 Pipet 50 mL of Cupric Chloride Solution into a 250-mL volumetric flask, and gently bubble air through the solution for 30 min. 

Solutions 4a and 4b Pipet 10 mL of the Sample Solution into each of two 250-mL volumetric flasks, add 50 mL of Cupric Chloride Solution to each, and bubble air gently through the solutions for 30 min. 

Deming et al. [88] studied the electrodialytic treatment of cupric chloride solutions discharged as wastewater after an etching process, using cationic and anionic... 

Methylamino-8-azapurine uniquely followed a more complex path. A simultaneous Dimroth rearrangement to 6-amino-9-methyl-8-azapurine (Section C,2) allowed two isomeric amidinotriazoles to be formed, one from each 8-azapurine. 6-Amino-8-azapurine, when set aside in cupric chloride solution, produced the following complex tetrachlorobis-2-[(4-amino-5-carboxamidinium)-l,2,3-triazole]copper +, the structure of which was verified by single-crystal X-ray work. ... 

In the Cuprex process, the copper sulfide concentrates were leached with a sodium chloride and ferric chloride solution in two stages to produce a cupric chloride solution. Copper is extracted by solvent extraction and recovered as powder by electrowinning. The process used... 

Derivation Copper and cupric chloride solution or copper and hydrochloric acid in air. 

Iron nails or wire and saturated cupric chloride solution. 

A Daniell cell consists of a zinc electrode in a zinc chloride solution connected to a copper electrode in a cupric chloride solution. 

A more definite picture is presented in the literature for cupric chloride solutions. Lagarde et al. (08) found evidence of Cu-Cl pairing in their EXAFS study, as did Libus (09) in spectrophotometric measurements which resulted in the following stability constants at 25 C ... 

A uniform view of complexes in a cupric chloride solution is found in the NBS (1) and Russian (2) thermodynamic data tables. Both present data for not only the CuCl complex, but also the aqueous molecule CuClj ... 

A 0.5% aqueous cupric chloride solution is an especially suitable spray reagent. 

Add, to 1 volume of trisodiiun phosphate solution (36-3 g of NajP04. I2H2O per litre), 1 volume of cupric chloride solution (27-3 g of CuClj. 2H20 per litre) and 4 volumes of disodium phosphate solution (25-6 g of... 

Ferric chloride or cupric chloride solution is recommended for use as the etching chemicals for flexible circuits, especially for high-density circuits. An alkaline solution has a higher process speed, but is not good on fine circuits because of unstable etching rates. As an alkaline solution makes some chemical attacks on polyimide surfaces, it should not be used for fine line requirements. 

Except for hydrofluoric acid, niobium is resistant to most organic and mineral acids at all temperatures below 212°F (100°C). This includes hydrochloric, hydroiodic, hydrobromic, nitric, sulfuric, and phosphoric acids. It is especially resistant under oxidizing conditions such as concentrated sulfuric acid and ferric chloride or cupric chloride solutions. 

Dissolve about 0-6 g, accurately w eighed, in 50 ml of water by warming gently, cool to 10 and add ammoniacal cupric chloride solution with stirring until the solution retains a deep blue colour. Allow the precipitate to stand for not less than one hour, then filter through a tared... 

In the Wacker two-stage process, the ethylene was completely oxidized with palladium chloride/cupric chloride solution at 110°C and 10 bar, with the stoichiometric volume of air in the reaction vessel. Acetaldehyde was recovered from the circulating solution and the palladium oxidized with air at lOO C and 100 bar pressme in a second vessel before the catalyst solution was letumed to the reactor. 

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