cerium(III) sulfate
{{chembox
| Watchedfields = changed
| verifiedrevid = 442345770
| Name = Cerium(III) sulfate
| ImageFile = Cerium(III) sulfate.svg
| ImageSize = 200px
| ImageName = Cerium(III) sulfate
| IUPACName = Cerium(III) sulfate
| OtherNames = Cerous sulfate
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| CASNo = 13454-94-9
| PubChem = 159674
| EC_number = 236-644-6, 246-392-9
| UNII = 0VF70O14R1
| ChemSpiderID = 140394
| InChI=1S/2Ce.3H2O4S/c;;3*1-5(2,3)4/h;;3*(H2,1,2,3,4)/q2*+3;;;/p-6
| InChIKey = OZECDDHOAMNMQI-UHFFFAOYSA-H
| SMILES = [O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[O-]S(=O)(=O)[O-].[Ce+3].[Ce+3]
}}
|Section2={{Chembox Properties
| Formula = Ce2(SO4)3
| MolarMass = 568.42 g/mol (anhydrous)
| Appearance = White to off white solid (anhydrous)
| Solubility = 9.25 g/100 mL (20 °C) Hygroscopic
| Density = 2.886 g/mL at (25 °C)
| MeltingPtC = 920
| MeltingPt_notes = (decomposes)
| BoilingPt = NA
| pKa =
}}
|Section7={{Chembox Hazards
| ExternalSDS = [http://www.chemcas.org/drug/analytical/cas/13454-94-9.asp External MSDS]
| MainHazards =
| GHSPictograms = {{GHS07}}
| GHSSignalWord = Warning
| HPhrases = {{H-phrases|315|319|335}}
| PPhrases = {{P-phrases|261|264|271|280|302+352|304+340|305+351+338|312|321|332+313|337+313|362|403+233|405|501}}
}}
}}
Cerium(III) sulfate, also called cerous sulfate, is an inorganic compound with the formula Ce2(SO4)3. It is one of the few salts whose solubility in water decreases with rising temperature. {{cite book|author1=Daniel L. Reger|author2=Scott R. Goode|author3=David Warren Ball|title=Chemistry: Principles and Practice|url=https://books.google.com/books?id=OUIaM1V3ThsC&pg=PA482|accessdate=23 March 2013|date=2 January 2009|publisher=Cengage Learning|isbn=978-0-534-42012-3|page=482}}
Cerium(III) sulfate (anhydrous) is a hygroscopic white solid, which begins to decompose above 600°C. It has a monoclinic crystal structure.
Cerium(III) sulfate tetrahydrate is a white solid that releases its water of crystallisation at 220 °C. It has (like the white octahydrate) a monoclinic crystal structure with the space group P21/c (space group 14). The nonahydrate has a hexagonal crystal structure with the space group P63/m (space group 176). Hydrates of this compound are known with 12, 9, 8, 5, 4 and 2 parts of water of crystallisation.