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Calcium Nitrite

Calcium nitrite represented by the chemical formula Ca(NO2)2 or CaN2O4 that bears the IUPAC name calcium dinitride [1] is an odorless white or light yellowish deliquescent powder that is very soluble in water and slightly in alcohol [4, 5]. It is a calcium salt and an ionic compound [1]. It should be protected from heat as temperatures higher than 220°C would lead to its reduction and decomposition into nitrous oxide [5].

Calcium Nitrite

Calcium Nitrite Identification

CAS Number 13780-06-8 [1]
PubChem CID 159695 [1]
ChemSpider ID 140414 [2]
EC Number 237-424-2 [1]

How to Make It

Calcium nitrite can be prepared in solution by reacting silver nitrite with calcium chloride [8].

2AgNO2 + CaCl2 = 2AgCl + Ca(NO2)2

Properties and Characteristics of Calcium Nitrite

General Properties

Molar mass/molecular weight 132.088 g/mol [1]

Physical Properties

Color/appearance White to yellow crystals [3]
Melting point/freezing point 390°C, 734°F [5]
Boiling point Unknown [3]
Density 2.265 g cm-3 [3]
State of matter at room temperature (normal phase) Solid [3]

Chemical Properties

Solubility in water 43 g/100g (at 18.5oC) [4]
pH 9.0 – 11.0 (basic) [6]

Atomic Properties

Crystal structure Hexagonal [4]

Calcium Nitrite Structure

Prominent Reactions

Calcium nitrite reacts with oxygen to form calcium nitrate [9].

Ca(NO2)2 + O2 = Ca(NO3)2

Chemical Formula for Calcium Nitrite

Calcium Nitrite Uses

  1. As a corrosion inhibitor in concrete, lubricants [3].
  2. Its high solubility facilitates its application as antifreeze either in powder or solution form. [5].
  3. To prepare calcium nitrate, an important component of many fertilizers [7].
  4. To safeguard metals from salt corrosion [7].

Is It Dangerous

The compound is poisonous and should not be combined with inflammable, organic articles. Under fire conditions, it emits hazardous toxic fumes. Ingestion, inhalation, eye and skin contact with it should be avoided [3, 6].

Calcium Nitrite Price

94% Ca(NO2)2 costs around $500-750 per metric ton. The price may vary with suppliers [10].

References:

  1. Calcium Nitrite – Pubchem.ncbi.nlm.nih.gov
  2. MFCD00049399 – Chemspider.com
  3. Calcium Nitrite (13780-06-8) – Chemicalbook.com
  4. Calcium Nitrite – Chemicalbook.com
  5. Calcium Nitrite – Wikiwand.com
  6. Calcium Nitrite Solution – Kemele.com
  7. Calcium Nitrite Fertilizer Uses – Homeguides.sfgate.com
  8. Calcium Nitrite, Ca(NO2)2Calcium.atomistry.com
  9. Calcium Nitrite – Sciencedirect.com
  10. Calcium Nitrite Price – Alibaba.com

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