Rubidium nitrate

Rubidium nitrate is an inorganic compound with the formula RbNO3. This alkali metal nitrate salt is white and highly soluble in water.

Rubidium nitrate
Unit cell
Unit cell of rubidium nitrate
IUPAC name
Rubidium nitrate
3D model (JSmol)
ECHA InfoCard 100.032.767
EC Number
  • 236-060-1
RTECS number
  • QV0900000
Molar mass 147.473 g/mol
Appearance White hygroscopic solid
Density 3.11 g/cm3
Melting point 310 °C (590 °F; 583 K) decomposes
Boiling point 578 °C (1,072 °F; 851 K)
44.28 g/100 mL (16 °C), 65 g/100 mL (25 C)[1]
−41.0·10−6 cm3/mol
a = 10.474 Å, c = 7.443 Å
707.2 Å3
Main hazards Oxidant
NFPA 704 (fire diamond)
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
4625 mg/kg (rat, oral)
Related compounds
Other anions
Rubidium sulfate
Rubidium chloride
Other cations
Lithium nitrate
Sodium nitrate
Potassium nitrate
Caesium nitrate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references


Solubility of rubidium nitrate in water

Rubidium nitrate is a white crystalline powder that is highly soluble in water and very slightly soluble in acetone. In a flame test, RbNO3 gives a mauve/light purple colour.


Rubidium compounds have very few applications.[1] Like caesium nitrate, it is used in infrared radiation producing pyrotechnic compositions as a colorant and an oxidizer, e.g. in decoys and illumination flares. It is also used as a raw material for preparation of other rubidium compounds and rubidium metal, for manufacture of catalysts and in scintillation counters. It is rarely used in fireworks to produce a red-violet colour.


RbNO3 can be prepared either by dissolving rubidium metal, its hydroxide or carbonate in nitric acid.

RbOH + HNO3 → RbNO3 + H2O
2 Rb + 2 HNO3 → 2 RbNO3 + H2


  1. ^ a b W. Lenk, H. Prinz, A. Steinmetz,"Rubidium and Rubidium Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. doi:10.1002/14356007.a23_473.pub2
  2. ^ Jutta Pohl, Dieter Pohl, Gunadi Adiwidjaja (1992). "Phase Transition in Rubidium Nitrate at 346 K and Structure at 296, 372, 413 and 437 K". Acta Crystallographica Section B. B48: 160–166. doi:10.1107/S0108768191013459.CS1 maint: multiple names: authors list (link)