Vlir. ACIDS— Nitric. 305 



gr. 1*55, the first bottle a weaker coloured acid, the second a pale 

 acid slightly impregnated with nitrous gas. 



Spirit of nitre. White pelre 24lb., oil of vitriol 121b.; distil 

 into 6 pints of water. 



Acide nitrique jaune ambre. Nitre 1701b., oil of vitriol lOOlb., 

 distil in a cast-iron cvlinder connected, by elbow pipes, with four 

 10 gall, bottles half-tilled with water; the first elbow pipe should 

 be of glass, to permit the colour of the vapour being seen. The 

 acid collected in the first bottle is impure, and may be used to 

 make single aqua fortis, that in the second and third bottles is 

 purer, that in the fourth bottle is put into the first bottle in the 

 next distillation. Iron pots with stone-ware heads are also used : 

 the acid thus obtained is redder, and yields less pale acid. It is 

 usually sold sp. gr. 1 -335, so that a bottle holding 5 oz. of water 

 shall hold 67 oz. of this acid, or at 36 deg. Baume. 



Xilric acid, Hectified spirit of nitre ^ Spiritus nitri decolor, Acide 

 nitricuin, P. E. Distil GeofFroy's spirit of nitre, in glass unluted 

 vessels, until the acid in the retort becomes colourless. It must 



i^^ kept in a dark place. 

 ^P Acidum nitricum, P. Bat. Oil of vitriol and water of each 

 " 2 oz., mix, and when cool, pour upon nitre 24 oz., distil to dry- 

 ness : if the acid is coloured, redistil it in unluted vessels until the 

 acid becomes pale. 



Acidum nitrosum diiiUum, A. 7iitriaim, P. Belg. GeofFroy's spi- 

 rit of nitre lb. j, water Ib.j, mix. 



Acidum nitricum, P. L. Nitre very pure and dried, oil of 

 \i(riol, ana 24 oz., distil till red fumes appear ; redistil from nitre 

 1 oz. : produces 15J oz. of white acid: the redistillation is use- 

 less ; sp. gr. should be 1'5 ; an ounce measure of it, diluted with 

 Iter, should dissolve 3vij of limestone; or 108 gr. ought to 

 -I urate 212 gr. of crystals of subcarbonate of soda. — Officinal 

 reparation. Acidum nitricum dilutum, L. Argenti nitras, L. 

 iquor ferri alkalini, L. Unguent, hydrargyr. nitratis, L. 

 1 ydrargyri nitrico-oxydum, L. Spiritus actheris nitrici, />. 



Acidum nitriann dibitum, P. L. Acid, nitricum 3j measure, 

 'distilled water ^ix measure. 



RFan Moni nitric acid. Nitre 71b., manganese lib., oil of 

 riol 41b. ; distil into water q. p. 

 )f§9aycr» nitric acid, Proof n/pia fortis. Aqua separataria. To 

 tt nitric acid add a solution of nitrate of silver as long as any 

 cloudiness is produced ; let it settle for a few days, pour off the 

 clear, and distil nearly to dryness. 



