Praseodymium(III) hydroxide

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Praseodymium(III) hydroxide
Praseodymium(III) hydroxide.jpg
3D model (JSmol)
ECHA InfoCard 100.036.815 Edit this at Wikidata
EC Number
  • 240-513-9
  • InChI=1S/3H2O.Pr/h3*1H2;/q;;;+3/p-3
  • [Pr+3].[OH-].[OH-].[OH-]
Molar mass 191.932
Appearance green solid[1]
Melting point 220 °C (493 K)(dissolves)[2]
Virtually insoluble in water
Related compounds
Other anions
Praseodymium(III) oxide
Other cations
Cerium(III) hydroxide
Neodymium(III) hydroxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Praseodymium(III) hydroxide is an inorganic compound with a chemical formula Pr(OH)3.


The reaction between ammonia water and praseodymium(III) nitrate produces praseodymium(III) hydroxide:[2]

Pr(NO3)3 + 3 NH3·H2O → Pr(OH)3↓ + 3 NH4NO3

Chemical properties[edit]

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.


  1. ^ Yi, Xianwu. Series of Inorganic Chemistry - Vol 7 (in Chinese). Science Press. pp. 168-171. (2) Hydroxides
  2. ^ a b 《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)
  3. ^ John Rumble (June 18, 2018). CRC Handbook of Chemistry and Physics (99 ed.). CRC Press. pp. 5–189. ISBN 1138561630.