Calcium nitrite

Base Information

• Chemical Name: Calcium nitrite
• CAS No.: 13780-06-8
• Molecular Formula: Ca.(NO2)2
• Molecular Weight: 132.089
• Hs Code.: 3102909000
• Mol file: 13780-06-8.mol

Synonyms:Nitrous acid, calcium salt;Nitrous acid, calcium salt (2:1);

Chemical Property of Calcium nitrite

Chemical Property:

• Appearance/Colour: white crystal, or granular
• Melting Point: 390oC
• Refractive Index: n20/D 1.3946
• Flash Point: 110 °C
• PSA: 104.98000
• Density: 2.23 g/cm³
• LogP: 0.50120
• Water Solubility.: slightly soluble alcohol [MER06]; g/100g solution H2O: 38.3 (0°C), 43.0 (18.5°C), 71.2 (91°C); solid phase Ca(NO2)2 · 4H2O (0°C, 18.5°C), Ca(NO2)2 ·2H2O (91°C) [KRU93]

Purity/Quality:

99% ^*data from raw suppliers

Calcium nitrite solution 30 wt. % in H2O ^*data from reagent suppliers

Safty Information:

• Safety Statements: 23-24/25

MSDS Files:

SDS file from LookChem

Total 1 MSDS from other Authors

Useful:

• Description: Calcium nitrite has the formula of Ca(NO2)2 and the molecular weight of 132.0894 g/mol. It can be made by the usual double decomposition reaction of sodium nitrite and CaCl2. It forms a tetrahydrate that is isomorphous with the strontium and barium salts: 2Na2NO2 (aq) + CaCl2 ? Ca(NO2)2 (aq) + 4NaCl (aq)
• Physical properties: Calcium nitrite, Ca(NO2)2, has the CAS number of 13780-06-8 and occurs as yellow-white crystals. It is very hygroscopic. Its density is 2.23 g/cm3 and it decomposes at 392°C to form nitrogen oxides and CaO. It is slightly soluble in alcohol. Ca(NO2)2·4H2O loses two waters of hydration at about 80°C and one at 105°C to form the monohydrate. It loses the other at about 155°C. The anhydrate, if further heated, is unstable and oxidizes to the nitrate in air above 220°C: Ca(NO2)2 + O2 + heat?Ca(NO3)2
• Uses: Calcium nitrite has several industrial uses: 1. Calcium nitrite has high solubility, so can be used as a solution or powder in concrete as an “anti-freeze” during winter months as needed. Using this antifreeze at negative temperature can promote the hydration of minerals in cement, and the freezing point of operative temperature can be reduced to –25°C. 2. This salt is a steel rust inhibitor: calcium nitrite can clean steel and protect it from rust, and can protect steel material in concrete used to construct buildings and structures, to extend the useful life of concrete in buildings. 3. In concrete, Ca(NO2)2 acts as a coagulator: calcium nitrite is free of chlorine and alkali, capable to reduce alkali aggregation of concrete and improve its early strength and compressive resistance. The calcium nitrite protects steel reenforcing bars from chlorideinduced corrosion. One advantage to calcium nitrite is that its protection mechanism is well defined. Data are known that show the levels of chloride to which given levels of calcium nitrite will protect. Once corrosion initiates, the rates are lower with calcium nitrite present. These results have been used to produce reinforced concrete structures with durability in excess of 50–100 years. 4. Calcium nitrite can be used as corrosion inhibitor when added to lubricating agents. 5. Calcium nitrite can also be used in pharmaceutical, dyes and metallurgy industries, as a mild reducing agent. Corrosion inhibitor in lubricants, concrete.