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Holmium(III) fluoride is a yellowish powder that can be produced by reacting holmium(III) oxide and ammonium fluoride, then crystallising it from the ammonium salt formed in solution. [34] Holmium(III) chloride can be prepared in a similar way, with ammonium chloride instead of ammonium fluoride. [ 35 ]
Holmium(III) oxide, or holmium oxide is a chemical compound of the rare-earth element holmium and oxygen with the formula Ho 2 O 3. Together with dysprosium(III) oxide (Dy 2 O 3 ), holmium oxide is one of the most powerfully paramagnetic substances known.
Holmium(III) chloride is the inorganic compound with the formula Ho Cl 3.It is a common salt but is mainly used in research. It can be used to produce pure holmium. [2] It exhibits the same color-changing behavior seen in holmium oxide, being a yellow in natural lighting and a bright pink color in fluorescent lighting.
Perchlorate concentration was the highest in Chilean nitrate, ranging from 3.3 to 3.98%. [52] Perchlorate in the solid fertilizer ranged from 0.7 to 2.0 mg g −1, variation of less than a factor of 3 and it is estimated that sodium nitrate fertilizers derived from Chilean caliche contain approximately 0.5–2 mg g −1 of perchlorate anion. [75]
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Ammonium perchlorate ("AP") is an inorganic compound with the formula NH 4 ClO 4.It is a colorless or white solid that is soluble in water. It is a powerful oxidizer.Combined with a fuel, it can be used as a rocket propellant called ammonium perchlorate composite propellant.
Holmium acetate can be obtained by dissolving holmium oxide in hot acetic acid [2]. Ho 2 O 3 + 6 CH 3 CO 2 H → 2 Ho(O 2 CH 3) 3 + 3 H 2 O. Dissolving holmium oxide in acetic acid at a pH of 4 will form the tetrahydrate of holmium acetate (Ho 2 (CH 3 COO) 6 ·4H 2 O): [3] The anhydrous material can be obtained by heating the hydrated acetate in acetic acid.
It is a powerful oxidizer when hot, but aqueous solutions up to approximately 70% by weight at room temperature are generally safe, only showing strong acid features and no oxidizing properties. Perchloric acid is useful for preparing perchlorate salts, especially ammonium perchlorate, an important rocket fuel component. Perchloric acid is ...