Praseodymium(III) hydroxide
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| Name =
| ImageFile = Praseodymium(III) hydroxide.jpg
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| Section1 = {{Chembox Identifiers
| CASNo = 16469-16-2
| CASNo_Ref = {{cascite|correct|CAS}}
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 77046
| PubChem = 85432
| EINECS = 240-513-9
| InChI =
| InChIKey =
| SMILES = [Pr+3].[OH-].[OH-].[OH-]
| StdInChI=1S/3H2O.Pr/h3*1H2;/q;;;+3/p-3
| StdInChIKey = ZLGIGTLMMBTXIY-UHFFFAOYSA-K
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| Section2 = {{Chembox Properties
| Formula = Pr(OH)3
| MolarMass = 191.932
| Appearance = green solidYi, Xianwu. Series of Inorganic Chemistry - Vol 7 (in Chinese). Science Press. pp. 168-171. (2) Hydroxides
| Density =
| MeltingPt = {{convert|220|C|K}}（dissolves）
| BoilingPt =
| Solubility = Virtually insoluble in water
| SolubilityProduct = 3.39{{e|−24}}{{cite book |author1=John Rumble |title=CRC Handbook of Chemistry and Physics |date=June 18, 2018 |publisher=CRC Press |isbn=978-1138561632 |pages=5–189|edition=99 |language=English}}
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| Section7 = {{Chembox Hazards
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| Section8 = {{Chembox Related
| OtherAnions = Praseodymium(III) oxide
| OtherCations = Cerium(III) hydroxide
Neodymium(III) hydroxide
| OtherCompounds =
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Praseodymium(III) hydroxide is an inorganic compound with a chemical formula Pr(OH)3.
Production
The reaction between ammonia water and praseodymium(III) nitrate produces praseodymium(III) hydroxide:《无机化合物制备手册》. 朱文祥 主编. 化学工业出版社. P98~99. 【III-103】氢氧化镨（praseodymium hydroxide）
: Pr(NO3)3 + 3 NH3·H2O → Pr(OH)3↓ + 3 NH4NO3
Chemical properties
Praseodymium(III) hydroxide can react with acid and produce praseodymium salts:
: Pr(OH)3 + 3 H+ → Pr3+ + 3 H2O, for example;
Pr(OH)3 + 3CH3COOH forms Pr(CH3CO2)3 + 3H2O;
Praseodymium(III) hydroxide + Acetic acid forms praseodymium(III) acetate and water.