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1 2 Divers, Chem. Soc. , 1899, 75, 85. Miiller and Spitzer, Zeitsch. , 1905, 11, 917. NITROUS ACID 45 Properties. Nitrous acid forms, in aqueous solution, a very unstable blue liquid, which rapidly loses its colour on standing, leaving only nitric acid in the solution. This is not due to atmospheric oxidation, since nitrous acid is oxidized only very slowly by air or oxygen. The decomposition may be represented by the equation 3HNO 2 ; = ± HNO 3 + 2NO + HoO. Its formation and decomposition can be demonstrated quite readily by dropping a few spots of liquid nitrogen trioxide (or tetroxide) into an excess of water, when a transient blue coloration is produced, and colourless bubbles of gas arise which turn brown on bursting at the surface, showing them to consist of nitric oxide.

Chim. ], 2, 817. Chem. £oc. , 1891, 59, 1076. Earnsay, Chem. Soc. , 1890, 58, 590. • i « ,t * ! l \ i . " • «i .. • V M,lphuric acid, id andd l d d . x '« , . • i , f\>I ,4 I Hue r a p a c i t y . The 4r- . ,•» ( fc u" ttm{HMture, and requires n i •, , , % ? tt , v, r. 4* „ . t . t}jt t», }H(ome v e r y vigorous. lfc ^ JI - , , *,i ' \ +,* I- f^i ,hM ua^t^ « preliminary . , i„ : ,» * * • i T ^ ) I»» fc i- i- thvn p a s s e d through . U f ^ ^ i- % i • ^ !. \i«lt. a n d finally into * . - '* U * i-- i i / ^ ' - i J i i fii'tviiii, m i x t u r e of ice and **** 1?

T h e r m a l D i s s o c i a t i o n of N 2 O 4 a n d N O 2 . Richardson, Chem. Soc. , 1887, 51, 402. 1 2 G e u t h e r , Annalen, R a m s a y , Zeitsch. 1888, 2 4 5 , 96. physikal. , 1890, 5 , 2 2 1 . NITROGEN PEROXIDE 35 Heated above its boiling-point the liquid tetroxide rapidly vaporizes to an orange-brown gas of peculiar odour. At higher temperature the colour deepens, again becoming lighter, and at still higher temperatures becoming finally colourless. The colour changes are probably due to t h e dissociation of the N 2 O 4 molecule.

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