J. L. Smith — Determination of the All a! fm^/ it j 



lone is to filter and separate the lime as ( i 

 - is left but the chloridcb of the dlkdu- i 

 I us follows: Throw the contuitb of tht ( , 

 the best size of which for the quaiitit> abo\t 

 ' Id 3.^ inches in diameter; ^^ \bh well, to do win i i ( 

 200 centimeters of water the wa&hmg is c\n it I 

 The contents of the filter (except in tho-^t i 

 ' IK nmt of the mineral is voi\ smdl md th( n i i 

 : ! tlio estimation of the other conbtitutnt-) i < i n i 

 it I'v desired to heat again to see if an\ til ii ti'i i n i i n 



Tlie filtrate contains in solution all the ill i i' 



••nil. together with some cMoride of ciknim n I n ti ' 

 to this solution, after it has been thiown nit > i [ 1 i n m i , 

 ct'laiu capsule, is added a solution of puu ( i! n i I um 

 uia (an amount equal to about one anil lull in - | 

 f'l). This precipitates all the lime a^ cith )n it it i- n i ' 

 ever, filtered immediately, butisevapoi it 1 \ i \\ it< i 1 

 to about 40 centimeters, and tothib i^addi ' i_ n hi 

 bonateof ammonia, and a few drops ot ( in-ti ni i i 

 precipitate the little lime that is redi^soKc 11 \ I . i ti. i t 

 sal-ammoniac on the carbonate of lime li t i )ii i m ill I 

 (2 m.) which is readily and thoroughly ^\ i-htd ^Mth 1 nt lit 

 \vater, and the filtrate allowed to run "into a -in dl beaku i 

 tins tiitrate are all the alkahes as chloride- and a little m1 at 

 iiJi'uiac. Add a drop of carbonate of ammonia to make ^u: 

 tiiat no lime is present. Evaporate o\ er a water bath m a tau 

 platinum dish, in' which the alkalies are to be wiiglul tl 

 capsLde used is about 60 centimeters capacity an I d^ nii_ tl 

 evaporation is never filled to more than two thirds it^ i q u if 

 After the filtrate has been evaporated to drvnes- tin 1 ott i 

 01 the dish is dried, and on a pioper -upport lu it. 1 ^u 

 geutly by a Bnnsen flame, to diuc otf the iittk m1 immonia^ 

 ^t IS well to cover the capsule with i piece o( thin pi VLUiuin 1 

 prevent any possible loss by the '^piitmg of the - It ^ttcr t: 

 sal-ammoniac has been driven oil b^ gradudh uitn i n;f tl: 

 Jeat, the temperature of the dish is brought up to a ] )int a litt 

 How redness, the cover being ofi (The co\er c in oe c h in< 

 jrom any sal-ammoniac that ma\ ha\e condensed uj). n it 

 heatmg it over the lamp.) The capsule is again (omu 1 i 

 Y^^ sufficiently cooled, and before becoming ta\l\ < 1 

 Piaced on the balance and weighed This weisht .nc> 

 ehlondes, the amount of alkahes contained in the mineral 



V the chloride of lithia be prc-ent, it is necessau to wt 

 ^P%, for this salt being very deliquescent take, moistu 



It not unfrequently happens tliat the chloride- at the end ( 

 tile analysis are more or less colored with a .mall amount of ca 



