Nitromagnesite

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Nitromagnesite[1]
Mg-NO3-2 (1).jpg
Mineralogical name Nitromagnesite
Chemical name Magnesium Nitrate Hexahydrate
Trivial name
Chemical formula Mg(NO3)2•6H2O
Other forms
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C 55.7%
Solubility (g/l) at 20°C 4.73 mol/kg
Density (g/cm³) 1.63 g/cm3
Molar volume 157.7 cm3/mol
Molar weight 256.41 g/mol
Transparency transparent
Cleavage perfect
Crystal habit
Twinning
Phase transition
Chemical behavior soluble in alcohol
Comments
Crystal Optics
Refractive Indices nx = 1.34
ny = 1.506
nz = 1.506
Birefringence Δ = 0.166
Optical Orientation negative
Pleochroism
Dispersion
Used Literature
[Steiger.etal:2014]Title: Weathering and Deterioration
Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja
Link to Google Scholar
[Broul.etal:1981]Title: Solubility in organic two component systems
Author: Broul M., Nyvlt J.; Soehnel O.
Link to Google Scholar


back to Nitrate

Solubility

Nitromagnesite has got a solubility of 4.7 mol/kg (at 20 °C). The solubility of nitromagnesite and other phases of the system Mg(NO3)2-H2O is shown in Fig. 1.


Figure 1: Solubility of magnesium nitrate in water. The molality m [n(Mg(NO3)2)•kg(H2O)-1] is plotted versus the temperature.


Hygroscopicity

The phase diagram of the system Mg(NO3)2-H2O is shown in Fig. 2.

Figure 1: Phase diagram of the system Mg(NO3)2-H2O. The water activity aw is plotted versus is plotted versus the temperature.



Table 1: Deliquescence humidities of nitromagnesite at different round temperatures [Steiger.etal:2014]Title: Weathering and Deterioration
Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja
Link to Google Scholar
0°C 10°C 20°C 30°C 40°C 50°C
61.3%r.h. 58.6%r.h. 55.7%r.h. 52.5%r.h. 49.2%r.h. 45.7%r.h.


References

Literature

[Broul.etal:1981]Elsevier (eds.) Broul M., Nyvlt J.; Soehnel O. (1981): Solubility in organic two component systems, ElsevierLink to Google Scholar
[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_4Link to Google Scholar