Nickel chloride, ammonia

Nickel chloride/ammonia solution. Transfer to a 100-ml graduated flask 8 0 g of ammonium bicarbonate that has been dried over silica gel at room temperature and stored in the same manner. Add exactly 25 ml of 4M ammonium chloride solution, exactly 20 ml of N ammonia solution and exactly 10 ml of a 1 per cent aqueous solution of nickel chloride hexahydrate and dilute to about 90 ml with water. Stopper the flask, shake vigorously until the ammonium bicarbonate has dissolved and dilute to olume with water. 

Method Pipette 10 ml of a prepared solution containing 0-4 to 4 mg of anhydrous morphine in 0 05N hydrochloric acid into each of two 25-ml graduated flasks. To the first flask add exactly 2 ml of a 4 5 per cent solution of reagent-grade iodic acid, with thorough mixing. After exactly two minutes add, by pipette, 10 ml of freshly prepared nickel chloride ammonia solution, again mix and dilute to volume with water... 

Tin-nickel alloy coatings are deposited from a bath containing stannous chloride, nickel chloride, ammonium bifluoride and ammonia " . The useful deposit contains 65% tin and the conditions are maintained to obtain... 

Anhydrous nickel carbonate is produced as a precipitate when calcium carbonate is heated with a solution of nickel chloride in a sealed tube at 150°C. Alternatively, treating nickel powder with ammonia and carbon dioxide followed by boding off ammonia yields pure carbonate. 

Nickel chloride is used in nickel electroplating baths. It also is used to prepare various nickel salts and nickel catalysts and in industrial gas masks to protect from ammonia. 

When ammonia gas is passed over anhydrous nickel chloride the product is an ammoniate, hexamine nickel chloride, NiCb GNHs. Ammoniate also can be prepared in solution by dissolving nickel chloride hexahydrate in an aqueous solution of 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. 

Dihydrazino - nickel Chloride, [Ni(N2H4)2]Cl2, is produced by mixing a hot aqueous solution of nickel chloride with 50 per cent, hydrazine hydrate, when a bluish-white precipitate separates which is washed with water and dried in vacuo. The substance is a bluish-white powder which is soluble in ammonia and in dilute acids.1... 

Trihydrazino-nickel Chloride, [Ni(N2H4)3]Cl2, is obtained by treating hexammino-niekel chloride with 50 per cent, aqueous hydrazine hydrate. On heating the mixture ammonia is evolved, and the hydra-zino-salt precipitated as a violet crystalline powder which dissolves in dilute acids, giving a blue solution. The corresponding hy drazino -compounds of nickel bromide are prepared in the same manner from nickel bromide and hexammino-niekel bromide. They are crystalline substances, and resemble the clilorides in appearance and in reactions. 

Twenty-four grams of nickel chloride 6-hydrate are dissolved in 40ml of warm water and 50ml of concentrated aqueous ammonia are added. The deep violet solution is cooled in ice a heavy crystalline mass of product separates out About 100ml of cold 95% alcohol is added to the mixture to complete the deposition the supernatant liquid should be almost colorless. After filtering, the product is washed with two 25ml portions of alcohol and dried in air. 

Six grams of nickel chloride 6-hydrate are dissolved in 30ml of water and concentrated ammonia is added until the Initial precipitate of hydroxide just barely dissolves about 10ml should be required. Perchloric acid (72%) is slowly added dropwise with stirring until the liquid above the precipitated violet solid is colorless. Approximately 5ml are needed. The solid is washed first with 10ml of ice water on the filter and then dried in warm air. 

Nickel salts readily combine with ammonia to fonn ammoniates, as, for example, the hexammoniates of nickel chloride, NiCl2.6NH3, and sulphate, NiS04.6NH3. Palladium salts act similarly. 

Another method consists in adding ammonia to the impure bromide in aqueous solution, whereby nickel bromide hexammoniate, NiBr2.6XH3, separates out in beautiful violet crystals. Since cobalt does not yield a similar derivative under like conditions, a very pure salt of nickel may be obtained in this way.2 The hexammoniate of nickel chloride, namely, NiCl .6NH3, may similarly be used. 

The hydrated salts of nickel such as nickel sulfate, NiSO GHgO. and nickel chloride, NiCU GHsO, are green in color. Nickelous hy droxide, Ni(OH)2, formed as an apple-green precipitate by addition of alkali to a solution containing nickelous ion. When heated it pro duces the insoluble green substance nickelous oxide, NiO. Nickelous hydroxide is soluble in ammonium hydroxide, forming ammonia com plexes such as Ni(NH3)4(HoO). + + and Ni(NHg)g+ +. ... 

On treatment with aqueous silver nitrate it forms a stable crystalline complex (78), from which 75 can be recovered almost quantitatively by addition of ammonia ". Anhydrous nickel(ii) bromide converts cyclooctyne into the trimer (79) with a quantitative yield . However, when the reaction was carried out in the presence of a trace of water, the dimeric cyclobutadiene-nickel bromide complex (80) was obtained in 9-4% yield, together with 79 (85%) . The spectroscopic properties of 80 showed close similarity with those of the tetramethylcyclobutadiene-nickel chloride complex . 

As protons are formed as charge compensation during the copper reduction, the catalysts also exhibit acid activity. This acidity was found to be beneficial in the substitution with ammonia [3] however, its influence in the substitution with water is a matter of discussion. On one hand, it was reported that the acidity of copper-ZSM-5 leads to a higher substitution rate [10] selectivity effects were not taken into account. On the other hand, it was concluded that the acidity of copper or nickel chloride impregnated ZSM-5 did not affect the catalytic activity, but the selectivity was found to be somewhat lower [4],... 

Material Test tubes solution of nickel chloride hydrate [Ni(H20)6]Cl2, diluted ammonia solution, diluted sodium hydroxide solution. 

Procedure Gradually add, in portions, ammonia solution to the green-colored nickel chloride solution until the color turns violet. Show and compare a 3D-model for the octahedron structure of the hexa ammine complex. Slowly add sodium hydroxide solution (drop by drop) into the violet-colored solution, for comparison also to the green-colored nickel chloride solution. 

The precipitate of nickel obtained on adding zinc dust to a solution of nickel chloride can be activated by treatment with aqueous ammonia (Urushibara Ni—NH3). This nickel catalyst contains appreciable amounts of residual ammonia and is suitable for reduction of nitriles to amines. Treating the nickel precipitate with sodium hydroxide solution gives the Urushibara Ni—B catalyst Urushibara Co—B catalyst is obtained analogously from cobalt chloride.180... 

PHYSICAL PROPERTIES (nickel chloride) yellow or brown scales nickel chloride hexahydrate appears as green, deliquescent crystals or crystal powder anhydrous salt is golden yellow odorless solid soluble in ethanol and ammonium hydroxide soluble in water insoluble in ammonia MP (1,001°C, 1834°F) DN (3.55 g/cm at 20°C) SG (3.55) VD (NA) VP (1 mmHg at 671°C). (nickel sulfate) yellow cubes nickel sulfate hexahydrate appears as blue to blue-green tetragonal crystals of green transparent crystals becomes blue and opaque at room temperature odorless soluble in water, ethanol, and methanol insoluble in alcohol, ether, and acetone MP (840°C, 1544°F loses SOj) DN (3.68 g/cm at 20°C) SG (3.68) VD (NA). 

OTHER COMMENTS nickel chloride is used for nickel-plating cast zinc used in the manufacture of sympathetic ink anhydrous salt is used as an absorbent for ammonia in gas masks nickel sulfate is used in nickel-plating used as a mordant in dyeing and printing fabrics used in blackening zinc and brass. 

Attapulgite Bismuth hydroxide Dextrin Kaolin Potassium hydroxide Silica gel Vermiculite absorbent charcoal substitute Fuller s earth absorbent, acid gases 2-Aminobutanol S (+) 2-Amino-1-butanol Aminoethyl propanediol Dimethylamine Methyidiethanolamine absorbent, acidic gases Aminomethyl propanediol Aminomethyl propanol 1,1-Dimethylhydrazine Tris (hydroxymethyl) aminomethane absorbent, ammonia Cobalt chloride (ous) Nickel chloride hexahydrate... 

Whenever any metal salt and any Bronsted base (an anion or other molecule with electronegative atoms, such as nitrogen or oxygen, that has the capacity to donate electrons) come into contact, coordination is likely to occur to give a complex compound. For example, when solid nickel chloride (yellow) reacts with a stream of ammonia gas, it is converted to purple hexamminenickel(II) chloride ... 

Nickel Chloride - 428 220 s nickel carbonyl, nickel hexammine chloride, ammonium carbonate, ammonia. H-. CO. CO . CO-CO pressure 2500 psig — specimens metallic-arc welded and stres 243 hrs. 

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