324' PiDf. H. Hose on the Isomeric Modifications 



nickel produce red and (jreenish-wliite precipiiates, which on 

 agitation subside in the form of lieavy oily drops of a red and 

 greenish-white colour. The precipitates are soluble in excess 

 of the soda salt. 



Solution of the nitrate of bismuth^ although it contains free 

 acid, produces a white precipitate, which on agitation becomes 

 somewhat resinous, but not oily. The precipitate is soluble 

 in the soda salt. 



If the acid contained in the salt of soda be separated from 

 the base, its aqueous solution exhibits somewhat different pro- 

 perties from those of the aqueous solution of the metaphos- 

 phoric acid produced by combustion in oxygen gas. The 

 solution of the soda salt was precipitated with nitrate of silver, 

 and the precipitate allowed to remain in the liquid during one 

 night; it was then washed with cokl water, and after suspen- 

 sion in water, was decomposed by a current of sulphuretted 

 hydrogen. The sulphuret of silver formed remains suspended 

 in the tree acid for a long time, and is separated by filtration 

 with extreme difficulty. 



The aqueous solution of the acid does not at first produce 

 any precipitate in chloride of barium ; after a considerable time 

 merely some flakes subside. Earytic water however produces 

 a precipitate in it, even when not added in excess, and whilst 

 the solution is still acid. 



Chloride of calcium produces no precipitate. Lime-water 

 only produces a precipitate when added in excess. 



A solution of sulphate of magnesia mixed with chloride 

 of ammonium, only produces a precipitate in the solution of 

 the acid saturated with ammonia, when the solutions are con- 

 centrated. This is, however, soluble in a considerable quan- 

 tity of water, and hence does not appear in dilute solutions. 



SoXntXou o^ nitrate of silver produces a white precipitate, 

 which on the saturation of the solution with ammonia becomes 

 more considerable. 



In a solution of albumen a copious white precipitate is im- 

 mediately formed. 



The reactions of a solution of metaphosphoric acid produced 

 by the combustion of phosphorus in oxygen gas, differ some- 

 what from those of the acid as procured from the salt of soda. 



Thus, a solution o'i chloride of barium immediately produces 

 a copious precipitate in it. A very large excess of the acid 

 is requisite to redissolve the precipitate ; ammonia does not 

 produce any precipitate in this solution. Barytic water pro- 

 duces a precipitate in the acid, even when the latter is in great 

 excess j an excess of barytic water, however, renders it more 

 copious. 



