Nickel III hydroxide

Nickel (III) Hydroxide. Add bromine water to a precipitate of nickel(II) hydroxide. What happens Write the equation of the reaction. How can you explain the different reaction of ironfll), cobalt(II), and nickel(II) hydroxides with the oxygen of the air Why does the method of preparing cobalt(III) and nickel (III) hydroxides differ from that of preparing iron(III) hydroxide How and why do the acid and basic properties of iron, cobalt, and nickel hydroxides change depending on their oxidation state ... 

Cobalt can also be separated from nickel in alkaline conditions by first adding ammonia and hydrogen peroxide to form cobalt(III) pentamine complex, and then crystallizing the bulk of the nickel as the sparingly soluble nickel ammonium sulfate (Figure 6.8). The separation of nickel from cobalt can be achieved by precipitation via oxidation to nickel(III) hydroxide with Caro s acid at near-neutral pH (Figure 6.9).257... 

The green nickel(II) hydroxide precipitate can be oxidized to black nickel(III) hydroxide with sodium hypochlorite solution ... 

If the solution of tetracyanonickelate(II) is heated with sodium hypobromite solution (prepared in situ by adding bromine water to sodium hydroxide solution), the complex decomposes and a black nickel(III) hydroxide precipitate is formed (difference from cobalt ions) ... 

Nickel(II) hydroxide test The auto-oxidation of sulphur dioxide (or sulphurous acid) induces the oxidation of green nickel(II) hydroxide to the black nickel(III) hydroxide. The colour change is quite distinct, but for very small amounts of sulphur dioxide use may be made of the conversion of benzidine acetate to benzidine blue by the nickel(III) hydroxide. (DANGER THE REAGENT IS CARCINOGENIC.) Thiosulphates give a similar reaction and must therefore be absent sulphides also interfere. 

NICKEL FLUOROBORATE see NDCOOO NICKEL(II) FLUOSILICATE (1 1) see NDDOOO NICKEL-GALLIUM ALLOY see NDD500 NICKEL(II) HYDROXIDE see NDEOOO NICKEL(III) HYDROXIDE see NDEOlO NICKELIC HYDROXIDE see NDEOlO NICKELIC OXIDE see NDH500 NICKEL IRON SULFIDE see NDE500 NICKEL-IRON SULFIDE MATTE see NDE500 NICKEL MONOANTIMONIDE see NCYIOO NICKEL MONOARSENIDE see NCYllO NICKEL MONOSULFATE HEXAHYDRATE see NDLOOO... 

Chlorine cannot be used in pure sulfate electrolyte nickel(III) hydroxide is normally used (28). Other oxidants that can be used to remove cobalt from the sulfate system include peroxide, persulfate, and ozone [5, p. 803]... 

Nickel (III) hydroxide. See Nickel hydroxide (ic) Nickel hydroxide (ic)... 

The oxidation of hydrazine follows the change in surface completely since it oxidizes rapidly on bare nickel and again on the nickel(III) oxide surface but in the intermediate potential region, where the surface is covered with nickel(II) hydroxide, the anodic oxidation cannot occur (Fleischmann etal., 1972d). 

Mixing of the electrode products causes hydrolytic precipitation of the nickel and, after separation of the nickel hydroxide, the filtrate was returned to the cells. The sequence of the electrolytic purification steps is outlined in Figure 6.28. Nickel hydroxide slurry is first added to the anolyte for the purpose of raising the pH to 3.7 (2 H+ + Ni(OH) = Ni2+ + 2 H20), and iron(II) is oxidized by introducing chlorine. This causes hydrolytic precipitation of the iron(III) and corrects the nickel ion deficiency by the low anodic current efficiency. The iron(III) hydroxide is removed by filteration. The clarified solution is then treated with nickel carbonate and further chlorine to oxidize the cobalt(II) and allow its separation as cobalt(I II) hydroxide. 

Preparation of Nickel(III) Oxide. Pour a little of a sodium hydroxide solution into a small amount of a nickel sulphate one while stirring, and then add a chlorinated lime (calcium hypochlorite) solution (which must be absolutely transparent). Let the mixture stand for several hours until the evolution of oxygen bubbles stops. Next heat it up to boiling. Let the mixture settle and wash the precipitate by decantation. Write the equation of the reaction. 

Such an activation of the electrode surface can, on the one hand, take place in situ by the continuous formation of the active redox agent on the electrode surface during the electrolysis. This is valid, for example, for the nickel(III)oxide hydroxide electrode which is spontaneously formed during anodic polarization of a... 

Nilv(dmg)3]2- is best carried out by addition of dmg2- to a basic suspension of the higher valent oxides or hydroxides in the presence of an oxidant, thereby avoiding formation of the insoluble, square-planar [Ni(dmgH)2]. With weaker oxidants, varying amounts of less well-characterized nickel(III) species are produced (39). 

Group reaction precipitates of various colours iron(II) sulphide (black), aluminium hydroxide (white), chromium(III) hydroxide (green), nickel sulphide (black), cobalt sulphide (black), manganese(II) sulphide (pink), and zinc sulphide (white). 

Only the hydrated oxides of cobalt(III) and nickel(IIl) are precipitated by alkali hypochlorites from cobalt(II) and nickel(II) solutions. Iron(III) hydroxide has two crystalline forms in the orthorhombic system, a-FeO(OH), dark brown needles, and y-FeO(OH), thin red plates. All other hydrates of Feg03 are mixtures of these with either FcgOg or absorbed water. 

Cobalt is present in almost all nickel ores. Previously there was no use for cobalt and as its value was less than that of nickel, it was not separated. Therefore, old nickel alloys contain much more cobalt than those of the present day. Two chemical methods are based on the oxidation of cobalt to three-valent ions. Cobalt is precipitated as cobalt(III) hydroxide by treating the solution with chlorine to oxidize the cobalt(II) to cobalt(III) and adding nickel carbonate to control the pH to 4 (27)... 

Alcohols can be oxidized to carboxylic acids at the nickel hydroxide electrode. Here, nickel hydroxide acts as an immobile mediator at the surface of a nickel net anode. It is oxidized at a low potential to nickel(III) oxide hydroxide, which abstracts a hydrogen from the hydroxymethyl group to generate a hydroxymethyl radical, which is then further oxidized. The nickel(II) hydroxide thereby formed is reoxidized without going into solution. The electrode is selective for primary alco-... 

When nickel (II, III) hydroxides form regular solid solutions in the whole range of compositions between p-Ni(OH)2 and P-NiOOH the experimental data can be... 

The hydroxide is readily filtered, comparing well with product made using chlorine or nickel(III) as the oxidant. The preferred pH range is 3.0-4.8, alkali being added to maintain this level. 

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