Nitronatrite

Authtor: Hans-Jürgen schwarz
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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]Title: Weathering and Deterioration Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja [Robie.etal:1978]Title: Thermodynamic properties of minerals and related substances at 298.15 K and 1 bar pressure and higher temperatures Author: Robie R.A., Hemingway B.S.; Fisher J.A.

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]Title: Weathering and Deterioration
Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja
.

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. In: U.S. Geol. Surv. Bull, 1452 ()
[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, 10.1007/978-3-642-45155-3_4.

A phase is a physically distinctive form of matter and is characterized by having relatively uniform chemical and physical properties.

concentration given as amount of substance (mol) of the dissolved substance per kilogram solvent; unit: mol•kg-1.