Nitrogen protoxide

The molybdenum and tungsten contents were determined by atomic absorption spectrometry in areducing flame of acetylene-nitrogen protoxid at the Service Central d1 Analyse du C.N.R.S. (Lyon). 

As an extraction fluid, supercritical carbon dioxide is mostly used because its critical parameters can be rather easy obtained (Tc = 31°C, Pc = 74 bar) and is non-polluting. Other supercritical fluids are nitrogen protoxide (Tc = 36°C, Pc = 71 bar), ammonia (Tc = 132°C, Pc = 115 bar) and water (Tc = 374°C, Pc = 217 bar). The supercritical fluids can be removed at low temperatures, without any toxic wastes but the necessary high pressure can be dangerous in industrial applications. The extractors are tubular devices, pressure resistant where the (semi) solid sample is placed. 

Nitrogen Monoxid. Nitrous oxid—Laughing gas—Nitrogen-protoxid—NaO—Molecular weight=4A—8p. f/r.=1.527A—Fuses at —100° (—148° F.)—Boils at —87° (—134° F.)—Discovered in 1770 bg Priestley. 

A still more intense degree of cold may bo attained by the rapid evaporation of liquids, such as bisulphide of carbon, ether, protoxide of nitrogen, and solid carbonic acid gas. By employing a bath of carbonic acid and ether in vacua, Faraday reduced the temperature... 

Showing that 1 eq. of ammonia and 1 eq. of nitric acid yield 3 eq. water, and 2 eq. protoxide of nitrogen. 

Protoxide of nitrogen is neutral or indifferent, and has hardly any tendency to combine with other bodies. According to Pelouze, however,it combines with the saltsof sulphurous acid, or sulphites. 

Nitrate of ammonia crystallises in prisms like those of nitrate of potash. It is used in the preparation of the protoxide of nitrogen or laughing gas. FormulaNH O, NO or NH, NO,. 

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