Nitrocalcite: Difference between revisions

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{{Infobox_Salt
{{Infobox_Salt
|Footnote            = <ref>http://www.mindat.org/min-2919.html seen on 29.07.2010</ref>
|Footnote            = <ref>http://www.mindat.org/min-2919.html seen on 29.07.2010</ref>
|photo                = HJS Ca(NO3)2 101703-10-1.jpg|300px
|photo                = [[File:HJS Ca(NO3)2 101703-10-1.jpg|300px]]
|mineralogical_Name  = Nitrocalcite
|mineralogical_Name  = Nitrocalcite
|chemical_Name        = Calcium Nitrate
|chemical_Name        = Calcium Nitrate Tetrahydrate
|Trivial_Name        = Nitrate of lime
|Trivial_Name        = Nitrate of lime
|chemical_Formula      =Ca(NO<sub>3</sub>)<sub>2</sub>•4H<sub>2</sub>O  
|chemical_Formula      =Ca(NO<sub>3</sub>)<sub>2</sub>•4H<sub>2</sub>O  
|Hydratforms          =
|Hydratforms          =Ca(NO<sub>3</sub>)<sub>2</sub>•2H<sub>2</sub>O ([[calcium nitrate dihydrate]]) <br> Ca(NO<sub>3</sub>)<sub>2</sub>•3H<sub>2</sub>O ([[calcium nitrate trihydrate]])
|Crystal_Class        =monoclinic
|Crystal_System      =monoclinic
|Crystal_Structure    =
|Crystal_Structure    =
|Deliqueszenzhumidity = 53,6
|Deliqueszenzhumidity = 53.06%
|Solubility          =
|Solubility          = 7.726 mol/kg
|Density              = 1,82 g/cm<sup>3</sup>
|Density              = 1.82 g/cm<sup>3</sup>
|MolVolume            = 129,8 cm<sup>3</sup>/mol  
|MolVolume            = 129.8 cm<sup>3</sup>/mol  
|Molweight            = 236,16 g/mol  
|Molweight            = 236.15 g/mol  
|Transparency        =
|Transparency        = transparent
|Cleavage            =
|Cleavage            =
|Crystal_Habit        =
|Crystal_Habit        =
|Twinning            =
|Twinning            =
|Refractive_Indices  = n<sub>x</sub> = 1,465<br>n<sub>y</sub> = 1,498<br>n<sub>z</sub> = 1,504  
|Refractive_Indices  = n<sub>x</sub> = 1.465<br>n<sub>y</sub> = 1.498<br>n<sub>z</sub> = 1.504  
|Birefringence        = Δ = 0,039
|Birefringence        = Δ = 0.039
|optical_Orientation  = negative
|optical_Orientation  = negative
|Pleochroism          =
|Pleochroism          =
Line 26: Line 26:
|chemBehavior        =
|chemBehavior        =
|Comments            =
|Comments            =
|Literature          =<bib id="Steiger.etal:2014"/> <bib id="Broul.etal:1981"/>
}}
}}


==Under the polarising microscope  ==
back to [[Nitrate]]


<gallery caption="Crysallised from a saturated solution with ethanol addition" widths="200px" heights="150px" perrow="3">
== Solubility ==
Image:HJS Ca(NO3)2 101703-4-6.jpg |in simple polarised light
[[file:Solubility of calcium nitrate in water.jpg|thumb|800px|left|'''Figure 1''' Solubility of calcium nitrate in water. The molality ''m'' [n(Ca(NO<sub>3</sub>)<sub>2</sub>•xH<sub>2</sub>O)•kg(H<sub>2</sub>O)<sup>-1</sup>] is plotted versus the temperature.]]
Image:HJS Ca(NO3)2 101703-4-5.jpg|under crossed polarisers
</br>
Image: HJS Ca(NO3)2 101703-4-4.jpg|under crossed polarisers and Red I
</br>
</br>
</br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br>
At 20 °C nitrocalcite is the stable phase of calcium nitrate. The salt has got a high solubilty in water and due to the temperature range of its stability it is relevant as a crystallizing phases under ambient conditions.
<br clear=all>
==Hygroscopicity==
 
[[file:Del Ca(NO3)2 e.jpg|thumb|800px|left|'''Figure 2''' Deliquescence behaviour of calcium nitrate. The water activity ''a<sub>w</sub>'' is plotted versus the temperature.]]
 
<br clear=all>
{|border="2" cellspacing="0" cellpadding="4" width="52%" align="left" class="wikitable"
|+''Table 1: Deliquescence humidities of nitrocalcite at different round temperatures <bib id="Steiger.etal:2014"/>''                   
|-
|bgcolor = "#F0F0F0" align=center| 0°C
|bgcolor = "#F0F0F0" align=center| 10°C
|bgcolor = "#F0F0F0" align=center| 20°C
|bgcolor = "#F0F0F0" align=center| 30°C
|bgcolor = "#F0F0F0" align=center| 40°C
|bgcolor = "#F0F0F0" align=center| 50°C
|-
|bgcolor = "#FFFFEO" align=center| 63.8%r.h.
|bgcolor = "#FFFFEO" align=center| 58.8%r.h.
|bgcolor = "#FFFFEO" align=center| 53.1%r.h.
|bgcolor = "#FFFFEO" align=center| 46.0%r.h.
|bgcolor = "#FFFFEO" align=center| 35.5%r.h.
|bgcolor = "#FFFFEO" align=center| 21.3%r.h. (Ca(NO<sub>3</sub>)<sub>2</sub>•3H<sub>2</sub>O)
|}
<br clear=all>
 
==Under the polarizing microscope  ==
 
<gallery caption="Crystallized from a saturated solution with ethanol addition" widths="200px" heights="150px" perrow="3">
Image:HJS Ca(NO3)2 101703-4-6.jpg |in simple polarized light
Image:HJS Ca(NO3)2 101703-4-5.jpg|under crossed polarizers
Image: HJS Ca(NO3)2 101703-4-4.jpg|under crossed polarizers and Red I
 
</gallery> <gallery caption="Crystallized in a [[micro climate chamber]]" widths="200px" heights="150px" perrow="3">
Image: HJS Ca(NO3)2 102003-4MC-0.jpg|in simple polarized light
Image: HJS Ca(NO3)2 102003-4MC-1.jpg|under crossed polarizers and Red I
</gallery>


</gallery> <gallery caption="Crystallised in a [[micro climate chamber]]" widths="200px" heights="150px" perrow="3">
Image: HJS Ca(NO3)2 102003-4MC-0.jpg|in simple polarised light
Image: HJS Ca(NO3)2 102003-4MC-1.jpg|under crossed polarisers and Red I
</gallery>
== Weblinks<br>  ==
== Weblinks<br>  ==


<references />
<references />


== Literature ==  
==Literature==
 
<biblist/>
<bibprint year=1994>Arnold</bibprint>
 


[[Category:Nitrocalcite]][[Category:Nitrate]][[Category:Salt]][[Category:Bearbeitung]]
[[Category:Nitrocalcite]][[Category:Nitrate]][[Category:Salt]][[Category:InProgress]][[Category:List]]

Latest revision as of 07:58, 3 May 2023

Nitrocalcite[1]
HJS Ca(NO3)2 101703-10-1.jpg
Mineralogical name Nitrocalcite
Chemical name Calcium Nitrate Tetrahydrate
Trivial name Nitrate of lime
Chemical formula Ca(NO3)2•4H2O
Other forms Ca(NO3)2•2H2O (calcium nitrate dihydrate)
Ca(NO3)2•3H2O (calcium nitrate trihydrate)
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C 53.06%
Solubility (g/l) at 20°C 7.726 mol/kg
Density (g/cm³) 1.82 g/cm3
Molar volume 129.8 cm3/mol
Molar weight 236.15 g/mol
Transparency transparent
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices nx = 1.465
ny = 1.498
nz = 1.504
Birefringence Δ = 0.039
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[edit]

Figure 1 Solubility of calcium nitrate in water. The molality m [n(Ca(NO3)2•xH2O)•kg(H2O)-1] is plotted versus the temperature.




























At 20 °C nitrocalcite is the stable phase of calcium nitrate. The salt has got a high solubilty in water and due to the temperature range of its stability it is relevant as a crystallizing phases under ambient conditions.

Hygroscopicity[edit]

Figure 2 Deliquescence behaviour of calcium nitrate. The water activity aw is plotted versus the temperature.


Table 1: Deliquescence humidities of nitrocalcite 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
63.8%r.h. 58.8%r.h. 53.1%r.h. 46.0%r.h. 35.5%r.h. 21.3%r.h. (Ca(NO3)2•3H2O)


Under the polarizing microscope[edit]

Weblinks
[edit]

Literature[edit]

[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_4.Link to Google Scholar