Nitronatrite

Authtor: Hans-Jürgen schwarz
back to Nitrate

Nitronatrite
Mineralogical name	Sodium Nitrate
Chemical name	Natriumnitrat
Trivial name	Nitratine, Nitratite, Soda Niter, Cubic Niter
Chemical formula	NaNO3
Other forms
Crystal system	trigonal
Crystal structure
Deliquescence humidity 20°C	75.3%
Solubility (g/l) at 20°C	10.347 mol/kg
Density (g/cm³)	2.26 g/cm3
Molar volume	37.6 cm3/mol
Molar weight	84.99 g/mol
Transparency	transparent
Cleavage	perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices	no = 1.587 ne = 1.336
Birefringence	Δ = 0.251
Optical Orientation
Pleochroism
Dispersion
Used Literature
[Steiger.etal:2014]Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja Booktitle: Stone in Architecture Chapter: 4 Editor: Siegesmund S. and Snethlage R. Pages: 223-316 Publisher: Springer Verlag Berlin Heidelberg Title: Weathering and Deterioration Year: 2014 [Robie.etal:1978]Author: Robie R.A., Hemingway B.S.; Fisher J.A. Journal: U.S. Geol. Surv. Bull Title: Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures Volume: 1452 Year: 1978

Solubility properties

Figure 1: Solubility of NaNO₃ in water. The molality m [n(NaNO₃)•kg(H₂O)^-1] is plotted versus the temperature.

Hygroscopicity

Figure 2: Deliquescence behaviour of sodium nitrate. The water activity a_w is plotted versus the temperature.

Table 1: Deliquescence humdities of sodium nitrate at different round temperatures [Steiger.etal:2014]Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja
Booktitle: Stone in Architecture
Chapter: 4
Editor: Siegesmund S. and Snethlage R.
Pages: 223-316
Publisher: Springer Verlag Berlin Heidelberg
Title: Weathering and Deterioration
Year: 2014
.

0°C	10°C	20°C	30°C	40°C	50°C
80.1%r.h.	77.7%r.h.	75.3%r.h.	72.8%r.h.	70.4%r.h.	68.0%r.h.

Under the polarizing microscope

• crystallized on a glass slide
• 

  Nitratine, under crossed polars.

• 

  Nitratine, crystallized from aqueous solution on a glass slide

Literature

[Robie.etal:1978]	Robie R.A., Hemingway B.S.; Fisher J.A. (1978): Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures. U.S. Geol. Surv. Bull, 1452 (%number%), %pages%, %url%, %doi%
[Steiger.etal:2014]	Steiger, Michael; Charola A. Elena; Sterflinger, Katja (2014): Weathering and Deterioration. In: Siegesmund S.; Snethlage R. (eds.): Stone in Architecture, Springer Verlag Berlin Heidelberg, 223-316, %url%, 10.1007/978-3-642-45155-3_4