Nickel(II) selenate

Nickel(II) selenate

Identifiers
CAS Number	15060-62-5 anhydrous Y 10101-99-2 hexahydrate Y
3D model (JSmol)	Interactive image
ChemSpider	13704804
ECHA InfoCard	100.035.554
EC Number	239-125-2
PubChem CID	18690621
CompTox Dashboard (EPA)	DTXSID10934009
InChI InChI=1S/Ni.H2O4Se/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+2;/p-2 Key: WCSBABHZOSWARI-UHFFFAOYSA-L
SMILES [Ni+2].[O-][Se](=O)(=O)[O-]
Properties
Chemical formula	NiSeO4
Molar mass	201.64
Appearance	green solid [1]
Density	4.8 g·cm−3 [2] 2.314 g·cm−3 (hexahydrate) [3]
Hazards
GHS labelling: [4]
Pictograms
Signal word	Danger
Hazard statements	H317, H334, H341, H350i, H360D, H372, H410
Precautionary statements	P203, P233, P260, P261, P264, P270, P271, P272, P273, P280, P284, P302+P352, P304+P340, P318, P319, P321, P333+P317, P342+P316, P362+P364, P391, P403, P405, P501
Related compounds
Other anions	nickel(II) sulfate
Other cations	iron(II) selenate cobalt(II) selenate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Nickel(II) selenate is a selenate of nickel with the chemical formula NiSeO₄.

Preparation

Nickel(II) selenate can be produced by the reaction of nickel(II) carbonate and selenic acid. ^[5]

${\displaystyle \mathrm {NiCO_{3}\ +H_{2}SeO_{4}\rightarrow NiSeO_{4}+H_{2}O+CO_{2}\uparrow } }$

Properties

Nickel(II) selenate hexahydrate is a green solid. ^[1] It is tetragonal, space group P4₁2₁2 (No. 92). ^[6] At 100 °C, nickel(II) selenate hexahydrate slowly loses water to the tetrahydrate, with space group P2₁/n (No. 14). At 510 °C, nickel(II) selenate decomposes directly into nickel selenite, which on further heating decomposes into nickel(II) oxide and selenium dioxide. ^{[7] [2]}

${\displaystyle \mathrm {NiSeO_{4}\cdot 6H_{2}O\ {\xrightarrow[{-H_{2}O}]{100\,^{\circ }C}}\ NiSeO_{4}\cdot 4H_{2}O\ {\xrightarrow[{-H_{2}O}]{300\,^{\circ }C}}\ NiSeO_{4}\cdot H_{2}O\ {\xrightarrow[{-H_{2}O}]{390\,^{\circ }C}}\ NiSeO_{4}\ {\xrightarrow[{-O_{2}}]{510\,^{\circ }C}}\ NiSeO_{3}\ {\xrightarrow[{-SeO_{2}}]{690\,^{\circ }C}}\ NiO} }$

It and potassium selenate are cooled and crystallized in hot aqueous solution to obtain the blue-green [Ni(H₂O)₆](SeO₄)₂. ^[8]

${\displaystyle \mathrm {K_{2}SeO_{4}\ +NiSeO_{4}+6H_{2}O\rightarrow K_{2}[Ni(H_{2}O)_{6}](SeO_{4})_{2}} }$

References

1. Recordof Nickelselenat in the GESTIS Substance Database of the Institute for Occupational Safety and Health, accessed on 2019-12-30.
2. R. J. Meyer (2013), [ at Google Books Nickel Teil B — Lieferung 2. Verbindungen bis Nickel-Polonium], Springer-Verlag, ISBN   978-3-662-13302-6 {{citation}}: Check |url= value (help)
3. William M. Haynes (2016), [ , p. 78, at Google Books CRC Handbook of Chemistry and Physics, 94th Edition], CRC Press, p. 78, ISBN   978-1-4665-7115-0 {{citation}}: Check |url= value (help)
4. "Nickel selenate". pubchem.ncbi.nlm.nih.gov.
5. Macintyre, Jane Elizabeth, ed. (1997). Dictionary of inorganic compounds. Vol. 9: Suppl. 4. Vol. 9. London: Chapman & Hall. ISBN   978-0-412-75020-5.
6. Fuess, H. (Dec 1970). "Die Kristallstruktur von Nickelselenat‐hexahydrat" . Zeitschrift für anorganische und allgemeine Chemie. 379 (2): 204–212. doi:10.1002/zaac.19703790212. ISSN   0044-2313.
7. Stoilova, D.; Koleva, V. (Jan 1997). "TG, DTA, DSC and X-ray powder diffraction studies on some nickel selenate hydrates" . Thermochimica Acta. 290 (1): 85–91. doi:10.1016/S0040-6031(96)03062-6.
8. Harald Euler, Bruno Barbier, Alke Meents, Armin Kirfel (September 2009). "Crystal structure of Tutton's salts K2[MII(H2O)6](SeO4)2, MII = Co, Ni, Zn and refinement of the crystal structure of potassium hexaaquamagnesium( II) selenate, K2[Mg(H2O)6](SeO4)2". Zeitschrift für Kristallographie - New Crystal Structures. 224 (3): 351–354. doi: 10.1524/ncrs.2009.0156 . ISSN   2197-4578. S2CID   201059907. Archived from the original on 2021-08-15. Retrieved 2021-05-28.