Names | |
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IUPAC name
Nickel(II) hydroxide
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Other names
Nickel hydroxide, Theophrastite
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Identifiers | |
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3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.031.813 |
EC Number |
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PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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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) |
0.0015 g/L[1] | |
Solubility product (Ksp)
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5.48×10−16[2] |
+4500.0·10−6 cm3/mol | |
Structure[3] | |
hexagonal, hP3 | |
P3m1, No. 164 | |
a = 0.3117 nm, b = 0.3117 nm, c = 0.4595 nm α = 90°, β = 90°, γ = 120°
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Thermochemistry | |
Std molar
entropy (S⦵298) |
79 J·mol−1·K−1[4] |
Std enthalpy of
formation (ΔfH⦵298) |
−538 kJ·mol−1[4] |
Hazards | |
GHS labelling:[5] | |
Danger | |
H302, H315, H317, H332, H334, H341, H350, H360, H372 | |
P201, P260, P280, P284, P405, P501 | |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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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).
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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]