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Oxygenated salts
Neodymium(III) sulfate can be directly obtained by dissolving neodymium(III) oxide in sulfuric acid. It is soluble in water, and its anhydrous form has a solubility of 8 g at 20˚C. Neodymium(III) nitrate can be obtained by dissolving neodymium(III) oxide in nitric acid. Evaporating the resulting solution yields hydrated neodymium(III) nitrate, where the hexahydrate form is the most common. Heating the hexahydrate further will obtain the anhydrous form. Reacting neodymium(III) chloride with sodium arsenate in solution would obtain neodymium(III) arsenate, which is a faint pink powder that is insoluble in water. It has good thermal stability, and its pKsp,c is 21.86±0.11. Neodymium(III) oxalate is a rose-coloured crystal which decomposes from its decahydrate to its anhydrous form when heated, and when heated further, decomposes to Nd2O2C2O4, and then finally obtaining neodymium(III) oxide. Neodymium(III) carbonate is the carbonate of neodymium where neodymium exhibits the +3 oxidation state. It can be obtained by reacting neodymium(III) chloride with ammonium bicarbonate in water or from the hydrolysis of neodymium(III) chloroacetate:


 * 2Nd(C2Cl3O2)3 + 3H2O → Nd2(CO3)3 + 6CHCl3 + 3CO2

Neodymium(III) acetate is a purple solid that is soluble in water. The solubility of the compound increases when sodium acetate is added, forming a blue complex. It can be obtained by the reaction of neodymium(III) chloride and sodium acetate:


 * NdCl3 + 3Na(CH3COO) → Nd(CH3COO)3 + 3NaCl