Rubidium nitrate
{{Short description|Chemical compound RbNO3}}
{{Chembox
| Watchedfields = changed
| verifiedrevid = 464384326
| ImageFile = RbNO3-xtal-1992-CM-3D-sf.png
| ImageFile1 = Rubidiumnitrat.png
| ImageSize1 = 250px
| ImageCaption1 = Unit cell of rubidium nitrate
| ImageAlt1 = Unit cell
| IUPACName = Rubidium nitrate
| OtherNames =
|Section1={{Chembox Identifiers
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 23971
| InChI = 1S/NO3.Rb/c2-1(3)4;/q-1;+1
| InChIKey = RTHYXYOJKHGZJT-UHFFFAOYAE
| SMILES = [Rb+].[O-][N+]([O-])=O
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/NO3.Rb/c2-1(3)4;/q-1;+1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = RTHYXYOJKHGZJT-UHFFFAOYSA-N
| InChIKey1 = RTHYXYOJKHGZJT-UHFFFAOYSA-N
| CASNo = 13126-12-0
| CASNo_Ref = {{cascite|correct|CAS}}
| EINECS = 236-060-1
| PubChem = 25731
| RTECS = QV0900000
}}
|Section2={{Chembox Properties
| Formula = RbNO3
| MolarMass = 147.473 g/mol
| Appearance = White hygroscopic solid
| Density = 3.11 g/cm3
| MeltingPtC = 310
| MeltingPt_notes = decomposes
| BoilingPtC = 578
| BoilingPt_notes =
| Solubility = 44.28 g/100 mL (16 °C)
65.0 g/100 mL (25 °C)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}}
| SolubleOther =
| Solvent =
| RefractIndex = 1.524
| MagSus = −41.0·10−6 cm3/mol
}}
| Section3 = {{Chembox Structure
| Structure_ref = {{Cite journal|title=Phase Transition in Rubidium Nitrate at 346 K and Structure at 296, 372, 413 and 437 K|author=Jutta Pohl, Dieter Pohl, Gunadi Adiwidjaja|journal=Acta Crystallographica Section B|volume=B48|date=1992|issue=2 |pages=160–166|doi=10.1107/S0108768191013459|doi-access=free}}
| CrystalStruct = trigonal
| SpaceGroup = P31
| PointGroup =
| LattConst_a = 10.474 Å
| LattConst_b =
| LattConst_c = 7.443 Å
| LattConst_alpha =
| LattConst_beta =
| LattConst_gamma =
| LattConst_ref =
| LattConst_Comment =
| UnitCellVolume = 707.2 Å3
| UnitCellFormulas =
| Coordination =
| MolShape =
| OrbitalHybridisation =
| Dipole =
}}
|Section7={{Chembox Hazards
| ExternalSDS =
| HPhrases =
| PPhrases =
| GHS_ref =
| MainHazards = Oxidant
| NFPA-H = 1
| NFPA-F = 0
| NFPA-R = 0
| NFPA-S = OX
| FlashPt = Non-flammable
| LD50 = 4625 mg/kg (rat, oral)
}}
|Section8={{Chembox Related
| OtherCations = Lithium nitrate
Sodium nitrate
Potassium nitrate
Caesium nitrate
| OtherAnions = Rubidium sulfate
Rubidium chloride
| OtherCompounds =
}}
}}
Rubidium nitrate is an inorganic compound with the formula RbNO3. This alkali metal nitrate salt is white and highly soluble in water.
Properties
Image:RbNO3 Solubilite dans eau.png
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.
Uses
Rubidium compounds have very few applications. Like caesium nitrate, it is used in infrared radiation optics, in pyrotechnic compositions as a pyrotechnic colorant and as an oxidizer, e.g. in decoys and illumination flares although it is rarely used in fireworks to produce a red-violet colour. 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.
Production
RbNO3 can be prepared either by dissolving rubidium metal, its hydroxide or carbonate in nitric acid.
:{{chem2 | RbOH + HNO3 -> RbNO3 + H2O }}
:{{chem2 | Rb2CO3 + 2 HNO3 -> 2 RbNO3 + CO2 + H2O }}
:{{chem2 | 2 Rb + 2 HNO3 -> 2 RbNO3 + H2 }}