Nickel ammonium chloride

Nickel Double Salts. Nickel ammonium chloride [16122-03-5], NiCl2 NH Cl -6H20, nickel ammonium sulfate [15699-18-0],... 

P3.08.17. NICKEL AMMONIUM CHLORIDE DECOMPOSITION. ZERO ORDER... 

The thermal decomposition of nickel ammonium chloride powder, [Ni(NH3)4]Cl2 = [Ni(NH3)2]Cl2 + 2NH3... 

The thermal decomposition of nickel ammonium chloride powder,... 

Doable Chlorides.—Nickel chlorides unite with the chlorides of many other metals, particularly the alkali metals and ammonium, to form double salts. Chief amongst these are nickel ammonium chloride, NH4C1. NiCIa. 6H20, which occurs as green, monoclinic crystals. Nickel lithium ckloride,10 LiCl. NiCl2.6H20, yields deliquescent, golden prisms. 

Na2B4H8011 sodium tetraborate tetrahydrate 12045-87-3 25.00 1.9500 1 3137 NiCI3H16N06 nickel, ammonium chloride hexahydrate — 25.00 1.6500 1... 

Nickel/ammonium chloride Prim, amines from ketones... 

Aqueous ammonia can also behave as a weak base giving hydroxide ions in solution. However, addition of aqueous ammonia to a solution of a cation which normally forms an insoluble hydroxide may not always precipitate the latter, because (a) the ammonia may form a complex ammine with the cation and (b) because the concentration of hydroxide ions available in aqueous ammonia may be insufficient to exceed the solubility product of the cation hydroxide. Effects (a) and (b) may operate simultaneously. The hydroxyl ion concentration of aqueous ammonia can be further reduced by the addition of ammonium chloride hence this mixture can be used to precipitate the hydroxides of, for example, aluminium and chrom-ium(III) but not nickel(II) or cobalt(II). 

Medium 20,000-50,000 4 Acrylic resins, plastics, PVC, ammonium chloride, DMT, copper compounds, lead Ferroalloys, fluorspar, nickel Iron, potash, glass-making mixtures... 

Pyrroline-N-oxides (12) are sometimes isolated when using zinc-ammonium chloride (19,20), iron-sulfuric acid (14) or hydrazine-Raney nickel (21) as reducing agents. During the reduction, dimerization has been often observed (22). 

Nickel-iron alloys are more resistant than iron to attack by solutions of various salts. In alternate immersion tests in 5% sodium chloride solution Fink and De Croly determined values of 2-8, 0-25 and 0-5 g m d for alloys containing 37, 80 and 100% nickel compared with 46 g m d for iron. Corrosion rates of about 0.4 g m d are reported by Hatfield for Fe-30Ni alloy exposed to solutions containing respectively 5 Vo magnesium sulphate, 10 Vo magnesium chloride and 10% sodium sulphate the same alloy corroded at a rate of about 1.2 g m d in 5% ammonium chloride. 

Nickel sulphate (N1S04-7H20) 180g/1 Nickel chloride (NiClj-fiHjO) 30g/1 Ammonium chloride (NH4CI) 25 g/1 Boric acid (HjBOj) 30 g/1... 

Pipette 25 mL nickel solution (0.01 M) into a conical flask and dilute to 100mL with de-ionised water. Add the solid indicator mixture (50mg) and 10 mL of the 1M ammonium chloride solution, and then add concentrated ammonia solution dropwise until the pH is about 7 as shown by the yellow colour of the solution. Titrate with standard (0.01 M) EDTA solution until the end point is approached, then render the solution strongly alkaline by the addition of 10 mL of concentrated ammonia solution, and continue the titration until the colour changes from yellow to violet. The pH of the final solution must be 10 at lower pH values an orange-yellow colour develops and more ammonia solution must be added until the colour is clear yellow. Nickel complexes rather slowly with EDTA, and consequently the EDTA solution must be added dropwise near the end point. 

Silver halides can be dissolved in a solution of potassium tetracyanonickelate(II) in the presence of an ammonia-ammonium chloride buffer, and the nickel ion set free may be titrated with standard EDTA using murexide as indicator. 

The procedure involved in the determination of these anions is virtually that discussed in Section 10.58 for the indirect determination of silver. The anion to be determined is precipitated as the silver salt the precipitate is collected and dissolved in a solution of potassium tetracyanonickelate(II) in the presence of an ammonia/ammonium chloride buffer. Nickel ions are liberated and titrated with standard EDTA solution using murexide as indicator ... 

When the conditions are controlled properly, Zn can mediate the reduction of the C-C double bond of a, (3-unsaturated carbonyl compounds in the presence of a nickel catalyst in aqueous ammonium chloride (Eq. 10.7). The use of ultrasonication enhances the rate of the reaction.15 Sodium hydrogen telluride, (NaTeH), prepared in situ from the reaction of... 

AMMONIUM CHLORIDE NITRIC OXIDE NITROGEN DIOXIDE HYDRAZINE NITROUS OXIDE SODIUM CYANIDE SODIUM FLUORIDE SODIUM HYDROXIDE NICKEL... 

Primary separation occurs in the leaching procedure, where the metals copper, zinc, and nickel are dissolved as metal ammonium chlorides or chloro complexes, while iron and chromium remain in the solid residue as hydroxides. 

Conversion of substituted nitrobenzenes to the arylhydroxylamine is easily achieved by reduction in neutral or slightly acid solution. In the first classical experiments, Haber [35] used a platinum cathode and ammonia ammonium chloride buffer and die process was improved by Brand [57] using either a nickel or silvered copper cathode in an acetate buffer. The hydroxylamine can also be obtained from reduction in dilute sulphuric acid provided tire temperature is kept below 15° C to suppress furtlier reduction [58]. This electrochemical route to arylhydroxylamines due to Brand is superior to the chemical reduction using zinc dust and ammonium chloride solution. The latter process is known to give variable yields depending on... 

Nickel chloride forms double salts with alkali metal chlorides or ammonium chloride. Such double salts, NH4Cl NiCl2 6H20, are obtained as hexahydrate when crystallized from a mixed solution of nickel chloride and ammonium chloride in equimolar amounts.. 

Rodriguez-Torres etal. [235] have used ammonia-containing baths for Zn-Ni alloy electrodeposition on Pt. Zinc and nickel species exist in the form of [Zn(NH3)4] + and [Ni(NH3)6] " complexes in such solutions. The deposition at pH 10 was investigated and compared with deposition from ammonium chloride baths at pH 5. The Ni content in the alloys was found to be 40-60% higher from the ammonia-containing bath than from the acidic baths. The deposition mechanism was found to be affected by complexation of the metal cations by ammonia. 

Hexammino-nickel Chloride, [Ni(NH3)6]Cl2.—Nickel chloride absorbs ammonia gas at ordinary temperature. Rise in temperature occurs and increase in volume. The hexammine is best prepared, however, from an aqueous solution of the salt, as when prepared from the dry salt and ammonia gas it is exceedingly bulky. Aqueous ammonia is added to a solution of pure nickel chloride until the nickel hydroxide first precipitated is almost dissolved. The liquid is filtered and a saturated aqueous solution of ammonium chloride containing ammonia added, and air drawn through the liquid. On the addition of a further quantity of ammonium chloride a precipitate forms, which is collected, washed with ammonium chloride and ammonia, and finally with alcohol containing ammonia. 

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