Chemical elements
    Physical Properties
    Chemical Properties
      Calcium Hydride
      Calcium Subfluoride
      Calcium Fluoride
      Calcium Subchloride
      Calcium Chloride
      Calcium Bromide
      Calcium Subiodide
      Calcium Iodide
      Calcium Periodides
      Calcium Halides
      Calcium Perhalides
      Calcium Oxychloride
      Calcium Hypochlorite
      Bleaching Powder
      Calcium Chlorite
      Calcium Chlorate
      Calcium Perchlorate
      Calcium Oxybromide
      Calcium Hypobromite
      Brome Bleaching Powder
      Calcium Bromate
      Calcium Oxyiodide
      Calcium Hypoiodite
      Iodine Bleaching Powder
      Calcium Iodate
      Calcium Periodate
      Calcium Manganites
      Calcium Manganate
      Calcium Permanganate
      Calcium Oxide
      Caustic lime
      Calcium Suboxide
      Calcium Hydroxide
      Calcium Peroxide
      Calcium Peroxyhydrates
      Calcium Tetroxide
      Calcium Monosulphide
      Calcium Hydrosulphide
      Calcium Polysulphides
      Calcium Hydroxyhydrosulphide
      Calcium Oxysulphides
      Calcium Thiosulphate
      Calcium Hyposulphite
      Calcium Sulphite
      Calcium Bisulphite
      Calcium Sulphite
      Calcium Dithionate
      Calcium Trithionate
      Calcium Sulphate
      Acid Calcium Sulphates
      Calcium Pyrosulphate
      Calcium Selenide
      Calcium Selenite
      Calcium Selenate
      Calcium Telluride
      Calcium Tellurite
      Calcium Tellurate
      Calcium Chromite
      Calcium Chromate
      Calcium Dichromate
      Calcium Tetrachromate
      Basic Calcium Chromate
      Calcium Chlorochromate
      Calcium Molybdate
      Calcium Tungstate
      Calcium Uranate
      Calcium Peruranate
      Calcium Nitride
      Calcium Azide
      Calcium Hexammoniate
      Calcium Ammonium
      Calcium Amide
      Calcium Imide
      Calcium Hydroxylamite
      Calcium Imidosulphonate
      Calcium Hyponitrite
      Calcium Nitrohydroxylaminate
      Calcium Nitrite
      Calcium Nitrate
      Basic Calcium Nitrates
      Calcium Phosphide
      Calcium Dihydrohypophosphite
      Calcium Hydrophosphite
      Neutral Calcium Phosphite
      Calcium Dihydrophosphite
      Acid Calcium Phosphite
      Neutral Calcium Hypophosphate
      Acid Calcium Hypophosphate
      Calcium Orthophosphates
      Calcium Pyro- Meta-phosphates
      Calcium Ultraphosphates
      Calcium Selenophosphate
      Basic Calcium Phosphates
      Phosphatic Fertilisers
      Calcium Arsenide
      Calcium Arsenites
      Calcium Arsenates
      Calcium Pyroarsenate
      Calcium Thioarsenites
      Calcium Thio-oxyarsenate
      Calcium Antimonide
      Calcium Antimonate
      Calcium Orthovanadate
      Calcium Pyrovanadate
      Calcium Metavanadate
      Calcium Pervanadate
      Calcium Pyro- Meta- niobates
      Calcium Pyro- Meta-tantalate
      Calcium Potassium Pertantalate
      Calcium Carbide
      Calcium Formate
      Calcium Acetate
      Calcium Oxalate
      Calcium Carbonate
      Calcium Bicarbonate
      Calcium Trithiocarbonate
      Calcium Perthiocarbonate
      Calcium Cyanide
      Calcium Oxycyanide
      Calcium Cyanamide
      Calcium Cyanate
      Calcium Cyanurate
      Calcium Thiocyanate
      Calcium Silicide
      Calcium Monosilicide
      Calcium Silicalcyanide
      Monocalcium Silicate
      Calcium Meta-silicate
      Calcium Orthosilicate
      Dicalcium Silicate
      Tricalcium Silicate
      Acid Calcium Silicate
      Calcium Fluosilicate
      Calcium Aluminates
      Monocalcium Aluminate
      Tricalcium Aluminate
      Pentacalcium Aluminate
      Calcium Stannate
      Calcium Chlorostannate
      Calcium Silicostannate
      Calcium Orthoplumbate
      Calcium Metaplumbate
      Acid Calcium Plumbate
      Calcium Metatitanate
      Calcium Fluotitanate
      Calcium Silicotitanate
      Calcium Zirconate
      Calcium Silicozirconate
      Calcium Boride
      Calcium Borates
      Calcium Silicoborate
      Calcium Borostannate
      Calcium Perborate
      Calcium Ferrate
    PDB 158d-1ajq
    PDB 1ak9-1ayk
    PDB 1ayo-1bg7
    PDB 1bg9-1byh
    PDB 1byn-1c8q
    PDB 1c8t-1cq1
    PDB 1cq9-1daq
    PDB 1dav-1dva
    PDB 1dvi-1el1
    PDB 1ela-1f4n
    PDB 1f4o-1fkq
    PDB 1fkv-1fzd
    PDB 1fze-1g9i
    PDB 1g9j-1gr3
    PDB 1gsl-1h5h
    PDB 1h5i-1hn4
    PDB 1hny-1i9z
    PDB 1ia6-1iyi
    PDB 1iz7-1jc2
    PDB 1jc9-1jui
    PDB 1jv2-1kck
    PDB 1kcl-1kvx
    PDB 1kvy-1led
    PDB 1lem-1lqd
    PDB 1lqe-1may
    PDB 1mbq-1mxe
    PDB 1mxg-1nfy
    PDB 1ng0-1nwg
    PDB 1nwk-1o3g
    PDB 1o3h-1om7
    PDB 1om8-1p7v
    PDB 1p7w-1pva
    PDB 1pvb-1qdo
    PDB 1qdt-1qq9
    PDB 1qqj-1rin
    PDB 1rio-1s10
    PDB 1s18-1scv
    PDB 1sdd-1su4
    PDB 1sub-1tf4
    PDB 1tf8-1top
    PDB 1tpa-1ujb
    PDB 1ujc-1uyy
    PDB 1uyz-1v73
    PDB 1v7v-1w2k
    PDB 1w2m-1wua
    PDB 1wun-1xkv
    PDB 1xmf-1y3x
    PDB 1y3y-1yqr
    PDB 1yr5-1zde
    PDB 1zdp-2a3x
    PDB 2a3y-2arb
    PDB 2are-2bd2
    PDB 2bd3-2bu4
    PDB 2bue-2c6g
    PDB 2c6p-2cy6
    PDB 2cyf-2dso
    PDB 2dtw-2eab
    PDB 2eac-2fe1
    PDB 2ff1-2fwn
    PDB 2fws-2gjp
    PDB 2gjr-2hd9
    PDB 2hes-2i6o
    PDB 2i7a-2ivz
    PDB 2iwa-2j7g
    PDB 2j7h-2jke
    PDB 2jkh-2kuh
    PDB 2kxv-2o1k
    PDB 2o39-2ovz
    PDB 2ow0-2pf2
    PDB 2pfj-2pyz
    PDB 2pz0-2qu1
    PDB 2qua-2re1
    PDB 2rex-2tmv
    PDB 2tn4-2vcb
    PDB 2vcc-2vqy
    PDB 2vr0-2w3i
    PDB 2w3j-2wlj
    PDB 2wm4-2wzs
    PDB 2x0g-2xmr
    PDB 2xn5-2z2z
    PDB 2z30-2zn9
    PDB 2zni-3a51
    PDB 3a5l-3ahw
    PDB 3ai7-3bcf
    PDB 3bdc-3bx1
    PDB 3bxi-3ch2
    PDB 3chj-3d34
    PDB 3d3i-3djl
    PDB 3dng-3e4q
    PDB 3e5s-3eqf
    PDB 3eqg-3faq
    PDB 3faw-3fou
    PDB 3foz-3gci
    PDB 3gcj-3gwz
    PDB 3gxo-3hjr
    PDB 3hkr-3i4i
    PDB 3i4p-3io6
    PDB 3ior-3k5m
    PDB 3k5s-3kqa
    PDB 3kqf-3lei
    PDB 3lek-3lum
    PDB 3lun-3mip
    PDB 3mis-3n7b
    PDB 3n7x-3nvn
    PDB 3nx7-3owf
    PDB 3ox5-3prq
    PDB 3prr-3sg5
    PDB 3sg6-3u39
    PDB 3u43-3vpp
    PDB 3zqx-4awy
    PDB 4awz-4dtu
    PDB 4dtx-4eoa
    PDB 4epz-5apr
    PDB 5bca-8tln
    PDB 966c-9rnt

Calcium Nitrite, Ca(NO2)2

Calcium Nitrite, Ca(NO2)2, may be obtained by careful calcination of the nitrate, with or without a reducing agent, but this is not satisfactory owing to the fact that the temperature at which decomposition of the nitrate commences is 500° C., whereas for the nitrite it is 220° C. It may also be prepared in solution by the action of silver nitrite on calcium chloride. From this it crystallises in very faintly yellow hexagonal needles which contain 1 molecule of water of crystallisation and are isomorphous with barium and strontium nitrites.

Dehydration over sulphuric acid appears to result in the formation of a half-hydrate, Ca(NO2)2H2O, and Oswald obtained a tetrahydrate Ca(NO2)2.4H2O, of density 1.674 at 0° C. The hydrated nitrite can be dehydrated in vacuo over phosphorus pentoxide without decomposition. The concentrated aqueous solution undergoes hydrolysis at 100° C., but neither the solid nitrite nor the saturated solution is oxidised by oxygen at atmospheric pressure. Oxidation only occurs in the presence of acids, and is then due to the oxidation of the decomposition products of nitrous acid.

Calcium nitrite is very soluble in water, but not in alcohol. A solution saturated at 16° C. contains 42.3 per cent, of nitrite, and has a density of 1.4205.

Oswald studied the system, calcium nitrite: water, from the point of view of the phase rule and obtained the following values for the concentration of the saturated solution of calcium nitrite at different temperatures: -

Temperature, ° C.Percentage Concentration of Solution.Solid Phase.

The eutectic point is at -17.5° C. at a concentration of 35 per cent, of nitrite. The transition from the tetra- to the mono-hydrate takes place at a temperature of 44°±2° C., and a concentration of 53.5±1 per cent.

The monohydrate is unchanged in air at ordinary temperatures, and the tetrahydrate effloresces, or is unchanged, according to the pressure of water vapour in the air. Over phosphorus pentoxide, under a pressure of a few centimetres of mercury, the tetra- changes to the mono-hydrate.

A double nitrite of calcium and caesium is known, Cs2Ca(NO2)4.H2O, and also one of calcium and mercury, Hg(NO2)2.Ca(NO2)2.5H2O, which Ray regarded as containing the complex divalent anion Hg(NO2)42-.

Triple nitrites with potassium and copper have been described.

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