268 An Analyns of 



Being agitated mth about half an ounce of distilled water, the 

 greater part was dissolved. The portion which, remained un- 

 dissolved, after being washed with small quantities of distvlled 

 water, and dried, weighed 2 4 grains. To this matter a little 

 diluted nitric acid iiei'ig added, a slight effervescence was ex- 

 cited : a tliin crust, too, adhered to the sides of the snudl glass 

 globe in which the last stage of the evaporation had been per- 

 formed, which was dissolved with effervescence by a weak acid. 

 The quLintity o{ carhovnle of lime thus indicated, may be esti- 

 mated at O'o grain. The remainder of the undissolved residue 

 being washed and dried, was heated witii two or three drops of 

 sulphuric acid, and was thus rendered soluble in writer. Whoii 

 neutralized bv ammonia, the solution became milkv; but its 

 transparency was restored by adding more water; it became 

 quite turbid on adding oxalate of potash, and a precipitate was 

 thrown down by alcohol. It was therefore sulphate of lime. 

 Its quantity may be stated at two grains. 



The solution had a taste purely saline. The test of oxalate 

 of ammonia^ however, showed the presence in it of a small quan- 

 tity of lime ; the addition of the oxalate was therefore continued 

 as long as any precipitation took place, and the precipitate was 

 collected and dried. It weighed \'2> grain. This production 

 of oxalate of lime evidently arose from the presence of a small 

 portion of muriate of lime, which, notwithstanding the precau- 

 tions that had been employed, had adhered to the muriate of 

 soda. Supposing that this had not escaped the action of the 

 alcohol, but had been dissolved bv it, and in the subsecjuent 

 stage of the experiment, been converted into sulphate of lime, 

 it would have increa,sed the quantity of this sulphate about 1"2 

 grain, making it therefore 21*7, equivalent to 17"6 grains (if 

 dry muriate cf lime which the pint of water contains. 



The solution contained also a minute quantity of sulphuric 

 acid ; for after removing any slight excess of oxalic acid that 

 might have been present, it still gave a precipitate on the addi- 

 tion of muriate of barytes. Supposing this, as well as the rest 

 of the sulphuric acid, to have existed in the water in the state 

 of sulphate of lime, it will increase the quantitv of that ingiedieut 

 (calculating from the weight of the precipitate of sul|)hate 

 of barytes obtained) from the two grains formerlv noticed to 

 2-9. " I 



There appeared now to remain nothing but pure muriate of i 

 soda. The solution by slow evaporation afforded that salt in i 

 cubical crystals, \^-hich, dried at a low red heat, weighed 24*5 i 

 grains. Allowing O'S of this as the portion of product formed } 

 by the action of the muriate of barytes, it leaves 23"7 grains. | 

 And if to this be added one grain, as the equivalent of the small i 



portion j; 



