Praseodymium(III) carbonate is an inorganic compound, with a chemical formula of Pr2(CO3)3. The anhydrous form is olive green, and many of its hydrates such as heptahydrate and octahydrate are known.[3] They are all insoluble in water.[2]

Preparation

Praseodymium(III) carbonate can be obtained by the hydrolysis of praseodymium(III) chloroacetate:[2][4]

2 Pr(C2Cl3O2)3 + 3 H2O → Pr2(CO3)3 + 6 CHCl3 + 3 CO2

It can also be obtained by reacting sodium bicarbonate saturated with carbon dioxide with a praseodymium chloride solution.[4]

Chemical properties

Praseodymium(III) carbonate is soluble in acids, and emits carbon dioxide:[5]

Pr2(CO3)3 + 6 H+ → 2 Pr3+ + 3 H2O + 3 CO2↑

However, it is insoluble in water.[2]

Other compounds

Praseodymium(III) carbonate forms compounds with N2H4, such as Pr2(CO3)3•12N2H4•5H2O which is a pale green crystal that is slightly soluble in water but insoluble in benzene, with d20°C = 1.873 g/cm3.[6]

References

  1. ^ 《化学化工物性数据手册》 (无机卷) . 化学工业出版社. P320. 7.2 碳酸盐. ISBN 7-5025-3591-8
  2. ^ a b c d 《无机化学丛书》. 第七卷 钪 稀土元素. 易宪武 黄春晖 等编.科学出版社. P174. 碳酸盐. ISBN 978-7-03-030574-9
  3. ^ Rare earth elements: Main volume, Phần 3 (Leopold Gmelin; Verlag Chemie, 1994), page 22; 68. Retrieved 4 Feb 2021.
  4. ^ a b 冯天泽. 稀土碳酸盐的制法、性质和组成. 《稀土》. 1989年第3期. pp.45～49
  5. ^ PubChem. "Praseodymium Carbonate Octahydrate". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-07-10.
  6. ^ Uchenye zapiski: Serii︠a︡ khimicheskikh nauk (S.M. Kirov adyna Azărbai̐jan Dȯvlăt Universiteti; 1977), page 37. Retrieved 7 Feb 2021.