Nickel II hydroxide

Addition of an alkali metal hydroxide solution to an aqueous solution of a nickel(II) salt precipitates a finely-divided green powder. nickel(II) hydroxide NilOHfj on heating this gives the black oxide. NiO. which is also obtained by heating nickel(II) carbonate or the hydrated nitrate. Black nickel(II) sulphide, NiS, is obtained by passing hydrogen sulphide into a solution of a nickel(II) salt. 

Nickel-hydroxyd, n. nickel hydroxide, -hy-droxydul, n. nickelous hydroxide, nickel(II) hydroxide. 

Jfickeloxydul, n. nickelous oxide, nickel(II) oxide, NiO. -hydrat, n, nickelous hydroxide, nickel (II) hydroxide, -salz, n. nickelous salt, nickel(II) salt, -verbindung,/. nickelous compound, nickel(II) compound. Nickelpapier, n. nickel foil, nickelplattiert, a. nickel-plated. 

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). 

C18-0074. For the following salts, write a balanced equation showing the solubility equilibrium and write the solubility product expression for each (a) lead(II) chloride (b) magnesium carbonate (c) nickel(II) hydroxide and (d) silver acetate. 

A redox half-reaction at an active electrode also may convert one metal salt into another. For example, the cathode In a nickel-cadmium battery is NiO(OH), which is reduced to nickel(II) hydroxide. The half-reaction reduces... 

Reduction to S(IV) is the basis of two spot tests of Feigl, although these apply to other S(VI) classes, e.g. sulphonamides. Thus Feigl and Lenzer fused the sample with alkali to yield sulphite, then treating with hydrochloric acid and warming to expel sulphur dioxide they detected the latter with nickel(II) hydroxide on test paper, which yielded ultimately the black Ni(IV) oxyhydrate (see also Section C). In the other test FeigF fused the sample with sodium formate/alkali, cooled and acidified with sulphuric acid to liberate sulphur dioxide in this case also. This was detected by a ferric chloride/potassium ferricyanide reagent which yielded a blue colour (Prussian, Turnbull s). 

From the above, it could be observed that ultrasound broke down the agglomerated precipitate of Ni-DMG complex to very fine particles, resulting in the formation of colloidal solution of Ni-DMG complex in the presence of an ultrasonic held. The settlement of particles was slow in the sonicated sample than in control sample. However, in the normal reaction, green precipitate of nickel (II) hydroxide dissolved in the excess NH3 solution and formed deep blue solution of hexammi-nenickel(II) ions, as under ... 

Kasprzak KS, Gabryel P, Jarczewska K. 1983. Carcinogenicity of nickel(II) hydroxides and nickel(II) sulfate in Wistar rats and its relation to the in vitro dissolution rates. Carcinogenesis 4 275-279. 

Another type of rechargeable battery is the nickel-cadmium, Ni-Cd, battery, cadmium acts as an anode, and nickel (IV) oxide is reduced to nickel (II) hydroxide, Ni(0H)2, at the cathode. As in the lead storage battery, the nickel-cadmium type can be recharged indefinitely. 

Nickel(II) Hydroxide. Prepare nickel(ll) hydroxide. Does it change when left in the air Write the equations of the reactions. 

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 ... 

Green precipitate of nickel (II) hydroxide, which dissolves in excess ammonia... 

Sodium hydroxide solution green precipitate of nickel(II) hydroxide ... 

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

Hydrogen peroxide solution however does not oxidize nickel(II) hydroxide, but the precipitate catalyses the decomposition of hydrogen peroxide to oxygen and water... 

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. 

Place a drop of the test solution (or a little of the test solid) in the tube of the apparatus shown in Fig. 11.53 and place a little washed nickel(II) hydroxide on the glass knob under the stopper. Add 1-2 drops 6m hydrochloric acid, close the apparatus and warm gently. The green hydroxide turns grey to black according to the amount of sulphite present. For small amounts of sulphites, transfer the nickel hydroxide to a quantitative filter paper and treat with a drop of the benzidine reagent a blue colour is formed. 

An alternative technique is to warm (water bath) the test solution in a semimicro test-tube with a little dilute hydrochloric acid, and expose the evolved gas to filter paper upon which a stain of nickel(II) hydroxide has been made. The stain acquires a black colour. 

The nickel(II) hydroxide is prepared by precipitating nickel(II) chloride solution with sodium hydroxide solution and washing thoroughly until free from alkali. It should be freshly prepared. 

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... 

Finely ground nickel(II) hydroxide is placed in a beaker of water. It sinks to the bottom of the beaker and remains unchanged. An aqueous solution of hydrochloric acid (HCl) is then added the beaker, and the Ni(0H)2 disappears. Which of the following equations best describes what occurred in the beaker ... 

Nickel (Ni, at. mass 58.71) usually occurs in the II oxidation state, but some complexes contain nickel in higher oxidation states (111 and IV). Nickel(II) sulphide is precipitated at pH 4. Nickel(II) hydroxide (precipitated at pH 7) dissolves in ammonia owing to formation of ammine complexes, but is insoluble in excess of NaOH. Nickel(ll) also forms stable cyanide, oxalate, and EDTA complexes. 

Write the formulas that correspond to the names nickel(II) hydroxide, ammonium chloride, and calcium hydrogen carbonate. 

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-... 

Mercury(I) bromide Mercury(I) carbonate Mercury(I) chloride Mercury(I) fluoride Mercury(I) iodide Mercury(I) oxalate Mercury(I) sulfate Mercury(I) thiocyanate Mercury(II) bromide Mercury(II) iodide Neodymium carbonate Nickel(II) carbonate Nickel(II) hydroxide Nickel(II) iodate Nickel(II) phosphate Palladium(II) thiocyanate Potassium hexachloroplatinate Potassium perchlorate Potassium periodate Praseodymium hydroxide... 

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