Term: Calcium nitrate
– **Production and Reactivity:**
– Norgessalpeter synthesized in Notodden, Norway in 1905 by the Birkeland–Eyde process.
– Most of the world’s calcium nitrate is made in Porsgrunn.
– Produced by treating limestone with nitric acid and neutralization with ammonia.
– Used to control certain plant diseases like bitter pit and cork spot in apple trees.
– Also sold as Cal-Urea.
– **Waste Water Treatment:**
– Calcium nitrate used in waste water pre-conditioning for odor emission prevention.
– Establishes an anoxic biology in the waste water system.
– Inhibits hydrogen sulfide formation by stopping sulfate metabolism.
– Consumes organic matter to prevent anaerobic conditions and odor emissions.
– Applicable for surplus sludge treatment.
– **Concrete:**
– Used in set accelerating concrete admixtures.
– Calcium ion accelerates formation of calcium hydroxide for setting.
– Nitrate ion leads to iron hydroxide formation reducing concrete corrosion.
– Used in cold weather concreting agents and some plasticizers.
– Enhances precipitation and setting of concrete.
– **Latex Coagulant:**
– Common coagulant in latex production, especially in dipping processes.
– Part of the dipping bath solution.
– Breaks up latex stabilization leading to coagulation.
– Used in forming thin film on formers for latex coagulation.
– Facilitates coagulation of latex on formers.
– **Cold Packs:**
– Dissolution of calcium nitrate tetrahydrate is highly endothermic (cooling).
– Used in regenerable cold packs for its cooling properties.
– Provides cooling effect upon dissolution.
– Utilized for cold therapy applications.
– Offers a cooling sensation when dissolved.
Calcium nitrate are inorganic compounds with the formula Ca(NO3)2(H2O)x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Hydrated calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.
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Other names
Kalksalpeter, Norgessalpeter, nitrocalcite, Norwegian salpeter, lime nitrate
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Identifiers | |
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3D model (JSmol)
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ChEBI | |
ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.030.289 |
EC Number |
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PubChem CID
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RTECS number |
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UNII |
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UN number | 1454 |
CompTox Dashboard (EPA)
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Properties | |
Ca(NO3)2 | |
Molar mass | 164.088 g/mol (anhydrous) 236.15 g/mol (tetrahydrate) |
Appearance | colorless solid hygroscopic |
Density | 2.504 g/cm3 (anhydrous) 1.896 g/cm3 (tetrahydrate) |
Melting point | 561 °C (1,042 °F; 834 K) (anhydrous) 42.7 °C (109 °F; 316 K) (tetrahydrate) |
Boiling point | decomposes (anhydrous) 132 °C (270 °F; 405 K) (tetrahydrate) |
anhydrous: 1212 g/L (20 °C) 2710 g/L (40 °C) tetrahydrate: 1050 g/L (0 °C) 1290 g/L (20 °C) 3630 g/L (100 °C) | |
Solubility | soluble in ammonia almost insoluble in nitric acid |
Solubility in ethanol | 51.4 g/100 g (20 °C) 62.9 g/100 g (40 °C) |
Solubility in methanol | 134 g/100 g (10 °C) 144 g/100 g (40 °C) 158 g/100 g (60 °C) |
Solubility in acetone | 33.08 g/100g (anhydrous, 25 °C) |
Acidity (pKa) | 6.0 |
-45.9·10−6 cm3/mol | |
Structure | |
cubic (anhydrous) monoclinic (tetrahydrate) | |
Hazards | |
GHS labelling: | |
Danger | |
H272, H302, H315, H319 | |
P210, P220, P221, P264, P270, P280, P301+P312, P302+P352, P305+P351+P338, P310, P321, P330, P332+P313, P337+P313, P362, P370+P378, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
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302 mg/kg (rat, oral) |
Safety data sheet (SDS) | ICSC 1037 |
Related compounds | |
Other anions
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Calcium sulfate Calcium chloride |
Other cations
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Magnesium nitrate Strontium nitrate Barium nitrate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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