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{{chembox |
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| verifiedrevid = 390239804 |
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| verifiedrevid = 429217095 |
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| ImageFile = Praseodymium_sulphate_octahydrate_crystals.JPG |
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| ImageFile = Praseodymium_sulphate_octahydrate_crystals.JPG |
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| ImageName = Praseodymium sulfate octahydrate crystals |
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| ImageCaption = Praseodymium sulfate octahydrate |
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| ImageSize = 250px |
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| ImageSize = 250px |
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| IUPACName = |
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| IUPACName = praseodymium(3+); trisulfate |
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| OtherNames = Praseodymium sulphate |
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| OtherNames = Praseodymium sulphate, dipraseodymium trisulphate, praseodymium(III) sulfate |
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| Section1 = {{Chembox Identifiers |
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|Section1={{Chembox Identifiers |
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| CASNo = 13510-41-3 |
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| CASNo = 10277-44-8 |
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| CASNo_Ref = {{cascite}} |
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| CASNo_Ref = {{cascite|correct|??}} |
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| CASNo2 = 13510-41-3 |
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| CASOther = <br/>10277-44-8 (octahydrate) |
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| CASNo2_Comment = (octahydrate) |
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| PubChem = |
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| EINECS = |
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| PubChem = 165851 |
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| PubChemOther = <br/>25022097 (octahydrate) |
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| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} |
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| ChemSpiderID =145346 |
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| InChI = 1S/3H2O4S.2Pr/c3*1-5(2,3)4;;/h3*(H2,1,2,3,4);;/q;;;2*+3/p-6 |
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| InChI2 = 1S/3H2O4S.8H2O.2Pr/c3*1-5(2,3)4;;;;;;;;;;/h3*(H2,1,2,3, |
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4);8*1H2;;/q;;;;;;;;;;;2*+3/p-6 (octahydrate) |
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| InChIKey = HWZAHTVZMSRSJE-UHFFFAOYSA-H |
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| InChIKey2 = IJXLQIGVGZNKP-UHFFFAOYSA-H (octahyrate) |
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| SMILES =S(=O)(=O).S(=O)(=O).S(=O)(=O).. |
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| SMILESOther =<br/>O.O.O.O.O.O.O.O.S(=O)(=O).S(=O)(=O).S(=O)(=O). |
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. (octahyrate) |
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| EINECS = 233-622-8 |
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| Section2 = {{Chembox Properties |
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|Section2={{Chembox Properties |
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| Formula = Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> |
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| Formula = Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> <br/>Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>·nH<sub>2</sub>O, n=2,5,8 |
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| MolarMass = 570.0031 g/mol<br>714.12534 g/mol (octahydrate) |
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| Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3·</sub>8H<sub>2</sub>O |
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| Appearance = green crystalline solid |
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| MolarMass = 570.0031 g/mol<br>714.12534 g/mol (octahydrate) |
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| Density = 3.72 g/cm<sup>3</sup><ref name=b1/> |
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| Appearance = green crystalline solid |
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| MeltingPtC = 1010 |
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| Density = g/cm<sup>3</sup> |
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| MeltingPt_notes = (decomposes)<ref name=b1/> |
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| MeltingPt = 931°C |
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| BoilingPt = 3127°C |
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| BoilingPt = |
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| Solubility = 113.0 g/l (20°C)<br />108.8 g/l (25°C) |
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| Solubility = 113.0 g/L (20 °C)<br />108.8 g/L (25 °C) |
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| MagSus = +9660·10<sup>−6</sup> cm<sup>3</sup>/mol |
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| Section7 = {{Chembox Hazards |
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|Section7={{Chembox Hazards |
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| ExternalMSDS = |
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| ExternalSDS = |
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| MainHazards = |
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| EUIndex = 233-622-8 |
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| GHS_ref=<ref>{{cite web |title=Dipraseodymium trisulphate |url=https://pubchem.ncbi.nlm.nih.gov/compound/165851#section=Safety-and-Hazards |website=pubchem.ncbi.nlm.nih.gov |access-date=27 December 2021 |language=en}}</ref> |
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| MainHazards = Xi |
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| GHSPictograms = {{GHS07}} |
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| RPhrases = 36/37/38 |
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| GHSSignalWord = Warning |
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| SPhrases = 26-36 |
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| HPhrases = {{H-phrases|315|319|335}} |
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| FlashPt = Non-flammable |
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| 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}} |
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| FlashPt = Non-flammable |
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| Section8 = {{Chembox Related |
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|Section8={{Chembox Related |
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| OtherAnions = Praseodymium carbonate<br />Praseodymium chloride |
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| OtherAnions = Praseodymium carbonate<br />Praseodymium chloride |
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| OtherCations = Neodymium sulfate |
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| OtherCations = Neodymium sulfate |
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| OtherCpds = ]<br/>] |
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| OtherCompounds = ]<br/>] |
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'''Praseodymium sulfate''' is a Pr compound with formula Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>. It is an odourless whitish-green crystalline compound. The anhydrous substance is somewhat ]. It has three well-defined hydrates: praseodymium dihydrate, praseodymium pentahydrate, and praseodymium octahydrate. When crystallized from aqueous solutions, the octahydrate is formed as green transparent crystals. |
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'''Praseodymium(III) sulfate''' is a ] compound with formula Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>. It is an odourless whitish-green crystalline salt. The anhydrous substance readily absorbs water forming pentahydrate and octahydrate.<ref name=b1/> |
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==Properties== |
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== Properties == |
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Praseodymium sulfate is stable under standard conditions. At elevated temperatures, it gradually looses any crystal water present, whereas its colour becomes more whitish. Like all rare earth sulfates, its solubility '''decreases''' with temperature, a property once used to separate it from other, non-rare earth compounds. |
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Praseodymium sulfate is stable under standard conditions. At elevated temperatures, it gradually loses water and becomes more whitish. Like all rare earth sulfates, its solubility ''decreases'' with temperature, a property once used to separate it from other, non-rare earth compounds. |
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Pentahydrate and octahydrate have monoclinic crystal structures with densities of 3.713 and 2.813 g/cm<sup>3</sup>, respectively. The octahydrate crystals are optically biaxial, with refractive index components of n<sub>α</sub> = 1.5399, n<sub>β</sub> = 1.5494 and n<sub>γ</sub> = 1.5607.<ref name=b1/> They belong to the ] C12/c1 (No. 15) and have lattice constants ''a'' = 1370.0(2) ], ''b'' = 686.1(1) pm, ''c'' = 1845.3(2) pm, β = 102.80(1)° and ''Z'' = 4.<ref name=j1/> |
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<!-- ==Synthesis== |
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Ammonium paramolybdate is easily prepared by dissolving ] in an excess of ] (a solution of NH<sub>3</sub> in water), and evaporating the solution at room temperature. While the solution evaporates, the excess of ammonia escapes. This method results in the formation of six-sides prisms of the tetrahydrate of ammonium paramolybdate, which are transparent as water .<br /> |
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Solutions of ammonium paramolybdate react acid. The pH value of a concentrated solution is between 5 and 6. |
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== Synthesis == |
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<!-- ==References== |
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Crystals of octahydrate can be grown from solution obtained by dissolving wet Pr<sub>2</sub>O<sub>3</sub> powder with ]. This procedure can be optimised by adding a few evaporation/dissolution steps involving organic chemicals.<ref name=j1/> |
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#L. Svanberg & H. Struve, J. pr. Ch. '''44''' , 282; cited in Gmelin's Handbuch für Anorganische Chemie, <u>53</u> 255 |
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== References == |
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{{Unreferenced|date=November 2009}} |
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{{reflist|refs= |
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<ref name=b1>{{cite book|author=National Research Council (U.S.)|title=Bulletin of the National Research Council|url=https://archive.org/details/bub_gb_LSYrAAAAYAAJ|accessdate=14 November 2011|year=1919|publisher=National Academies|pages=–|id=NAP:12020}}</ref> |
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<ref name=j1>{{cite journal|title=Redeterminaton of the crystal structure of praseodymium sulfate octahydrate, Pr<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>·8H<sub>2</sub>O|journal=Zeitschrift für Kristallographie – New Crystal Structures|volume= 217 |year=2002|pages= 299–300|author=Y.-Q. Zheng, Y.-J. Zhu and J.-L. Lin|doi=10.1524/ncrs.2002.217.jg.299|s2cid=201278521|doi-access=free}} </ref> |
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{{DEFAULTSORT:Praseodymium Sulfate}} |
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] |
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] |
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{{Praseodymium compounds}} |
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{{Praseodymium compounds}} |
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{{Sulfates}} |
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{{inorganic-compound-stub}} |
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{{DEFAULTSORT:Praseodymium Sulfate}} |
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] |
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] |