Nickel(II) hydroxide

Nickel(II) hydroxide
Names
	IUPAC name Nickel(II) hydroxide
	Other names Nickel hydroxide, Theophrastite
Identifiers
CAS Number	12054-48-7 ; 36897-37-7 (monohydrate) ;
3D model (JSmol)	Interactive image;
ChemSpider	55452 ;
ECHA InfoCard	100.031.813
EC Number	235-008-5;
PubChem CID	61534;
RTECS number	QR648000;
UNII	L8UW92NW6J ;
CompTox Dashboard (EPA)	DTXSID90274011 ;
	InChI InChI=1S/Ni.2H2O/h;21H2/q+2;;/p-2 Key: BFDHFSHZJLFAMC-UHFFFAOYSA-L ; InChI=1/Ni.2H2O/h;21H2/q+2;;/p-2 Key: BFDHFSHZJLFAMC-NUQVWONBAJ;
	SMILES [Ni+2].[OH-].[OH-];
Properties
Chemical formula	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)
Solubility in water	0.0015 g/L
Solubility product (Ksp)	5.48×10−16
Magnetic susceptibility (χ)	+4500.0·10−6 cm3/mol
Structure
Crystal structure	hexagonal, hP3
Space group	P3m1, No. 164
Lattice constant	a = 0.3117 nm, b = 0.3117 nm, c = 0.4595 nm α = 90°, β = 90°, γ = 120°
Thermochemistry
Std molar; entropy (S⦵298)	79 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−538 kJ·mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H315, H317, H332, H334, H341, H350, H360, H372
Precautionary statements	P201, P260, P280, P284, P405, P501
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	1515 mg/kg (oral, rat)
Safety data sheet (SDS)	External SDS
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Nickel(II) hydroxide is the inorganic compound with the formula Ni(OH)₂. It is a lime-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.^[6]

^ CRC Handbook of Chemistry and Physics (84 ed.). CRC press. 2003. pp. 4–71. ISBN 0849304849.
^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–189. ISBN 978-1138561632.
^ Enoki, Toshiaki; Tsujikawa, Ikuji (1975). "Magnetic Behaviours of a Random Magnet, Ni_pMg_(1-p)(OH₂)". Journal of the Physical Society of Japan. 39 (2): 317. Bibcode:1975JPSJ...39..317E. doi:10.1143/JPSJ.39.317.
^ ^a ^b Zumdahl, Steven S. (2009). Chemical Principles (6 ed.). Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.
^ "Nickel Hydroxide". American Elements. Retrieved 2018-08-30.
^ Chen, J.; Bradhurst, D.H.; Dou, S.X.; Liu, H.K. (1999). "Nickel Hydroxide as an Active Material for the Positive Electrode in Rechargeable Alkaline Batteries". Journal of the Electrochemical Society. 146 (10): 3606–3612. Bibcode:1999JElS..146.3606C. doi:10.1149/1.1392522. S2CID 33058220.

[1] CRC Handbook of Chemistry and Physics (84 ed.). CRC press. 2003. pp. 4–71. ISBN 0849304849.

[crc-2] John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–189. ISBN 978-1138561632.

[3] Enoki, Toshiaki; Tsujikawa, Ikuji (1975). "Magnetic Behaviours of a Random Magnet, Ni_pMg_(1-p)(OH₂)". Journal of the Physical Society of Japan. 39 (2): 317. Bibcode:1975JPSJ...39..317E. doi:10.1143/JPSJ.39.317.

[b1-4] Zumdahl, Steven S. (2009). Chemical Principles (6 ed.). Houghton Mifflin Company. p. A22. ISBN 978-0-618-94690-7.

[sds-5] "Nickel Hydroxide". American Elements. Retrieved 2018-08-30.

[Chen-6] Chen, J.; Bradhurst, D.H.; Dou, S.X.; Liu, H.K. (1999). "Nickel Hydroxide as an Active Material for the Positive Electrode in Rechargeable Alkaline Batteries". Journal of the Electrochemical Society. 146 (10): 3606–3612. Bibcode:1999JElS..146.3606C. doi:10.1149/1.1392522. S2CID 33058220.

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