In nickel processing: Chemical compounds. Nickel dimethylglyoxime is an insoluble salt useful in analytical chemistry in precipitating nickel. Nickel carbonyl, Ni(CO) 4, a liquid at room temperature, is employed in the carbonyl nickel-refining process.Like all other carbonyls, it is poisonous. Nickel subsulfide, Ni 3 S 2, is the nickel component of matte involved. Mar 10, 2011 What is the chemical formula for cobalt DMG complex. Ni(dmg) complex favorable (ii) Because d8 configuration is stabilized most in square-planar. Enter a chemical formula to calculate its molar mass and elemental composition: Molar mass of Ni(dmg)2 is 288.9146 g/mol Convert between Ni((CH3C(NOH)C(NO)CH3))2 weight and moles. 25481-21-4 - HTLPAEWBUABNNS-UHFFFAOYSA-L - Nickel(II) EDTA complex - Similar structures search, synonyms, formulas, resource links, and other chemical information.

Nickel(II) hydroxide
Names
IUPAC name
Other names Nickel hydroxide, Theophrastite
Identifiers
12054-48-7 36897-37-7 (monohydrate)
ChemSpider
ECHA InfoCard	100.031.813
EC Number	235-008-5
RTECS number
CompTox Dashboard(EPA)
Key: BFDHFSHZJLFAMC-UHFFFAOYSA-L Key: BFDHFSHZJLFAMC-NUQVWONBAJ
[Ni+2].[OH-].[OH-]
Properties
Ni(OH)₂
Molar mass	92.724 g/mol (anhydrous) 110.72 g/mol (monohydrate)
Appearance	green crystals
Density	4.10 g/cm³
Melting point	230 °C (446 °F; 503 K) (anhydrous, decomposes)
0.13 g/L
+4500.0·10⁻⁶ cm³/mol
Structure^[1]
hexagonal, hP3
P3m1, No. 164
α = 90°, β = 90°, γ = 120°
Thermochemistry
79 J·mol⁻¹·K⁻¹^[2]
Std enthalpy of formation(Δ_fH^⦵₂₉₈)	−538 kJ·mol⁻¹^[2]
Hazards
Safety data sheet	External SDS
GHS pictograms	^[3]
GHS Signal word	Danger^[3]
H302, H332, H315, H334, H317, H341, H350, H360, H372^[3]
P260, P284, P201, P280, P405, P501^[3]
Lethal dose or concentration (LD, LC):
1515 mg/kg (oral, rat)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

The test tube in the middle contains a precipitate of nickel(II) hydroxide

Nickel(II) hydroxide is the inorganic compound with the formula Ni(OH)₂. It is an apple-green solid that dissolves with decomposition in ammonia and amines and is attacked by acids. It is electroactive, being converted to the Ni(III) oxy-hydroxide, leading to widespread applications in rechargeable batteries.^[4]

Properties[edit]

Nickel(II) hydroxide has two well-characterized polymorphs, α and β. The α structure consists of Ni(OH)₂ layers with intercalated anions or water.^[5]^[6] The β form adopts a hexagonal close-packed structure of Ni²⁺ and OH⁻ ions.^[5]^[6] In the presence of water, the α polymorph typically recrystallizes to the β form.^[5]^[7] In addition to the α and β polymorphs, several γ nickel hydroxides have been described, distinguished by crystal structures with much larger inter-sheet distances.^[5]

The mineral form of Ni(OH)₂, theophrastite, was first identified in the Vermion region of northern Greece, in 1980. It is found naturally as a translucent emerald-green crystal formed in thin sheets near the boundaries of idocrase or chlorite crystals.^[8] A nickel-magnesium variant of the mineral, (Ni,Mg)(OH)₂ had been previously discovered at Hagdale on the island of Unst in Scotland.^[9]

Reactions[edit]

Nickel(II) hydroxide is frequently used in electrical car batteries.^[6] Specifically, Ni(OH)₂ readily oxidizes to nickel oxyhydroxide, NiOOH, in combination with a reduction reaction, often of a metal hydride (reaction 1 and 2).^[10]

Reaction 1 Ni(OH)₂ + OH⁻ → NiO(OH) + H₂O + e⁻

Reaction 2 M + H₂O + e⁻ → MH + OH⁻

Net Reaction (in H₂O)Ni(OH)₂ + M → NiOOH + MH

Of the two polymorphs, α-Ni(OH)₂ has a higher theoretical capacity and thus is generally considered to be preferable in electrochemical applications. However, it transforms to β-Ni(OH)₂ in alkaline solutions, leading to many investigations into the possibility of stabilized α-Ni(OH)₂ electrodes for industrial applications.^[7]

Synthesis[edit]

The synthesis entails treating aqueous solutions of nickel(II) salts with potassium hydroxide.^[11]

Ni Dmg 2 Complex

Toxicity[edit]

The Ni²⁺ ion is a known carcinogen. Toxicity and related safety concerns have driven research into increasing the energy density of Ni(OH)₂ electrodes, such as the addition of calcium or cobalt hydroxides.^[4]

References[edit]

Chemical Formula For Ni Dmg 2