Mr. Watts on the Analysis of Hop- Ash. 55 



2. 50 grs. of ash treated in the same manner gave— 



Insoluble matter = 31-87 = 63-74 per cent. 

 Soluble matter =18'13 = 36-26 



3. These results differ by about 1 per cent.; the difference 

 probably arises from the slow decomposition of an alkaline 

 silicate by continued digestion in hot water. 



Taking the mean of the two results, we have — 



Matter insoluble in water =64-23 per cent. 

 ... soluble ... =35-77 - 



B. Matter soluble in water. 



1. Acids and Chlorine.— I. Alkahne liquid from 100 grs. of 

 ash (A. 1) concentrated by evaporation to the bulk of 1000 

 water grain-measures, then divided into four equal portions. 



2. First portion decomposed by sulphuric acid in flask-ap- 

 paratus gave 0-54 gr. of cai'bonic acid=2-16 per cent. 



3. Second portion treated with chloride of barium and ni- 

 tric acid gave 6-03 grs. of sulphate of baryta : therefore 2*07 

 grs. of sulphuric acid = S-28 per cent. 



4. Third portion treated with fnitrate of silver and nitric 

 acid gave 2-29 grs. of chloride of silver : therefore 0*564 gr. 

 of chlorine = 2-26 per cent. 



5. Fourth portion mixed with solution of pernitrate of u'on 

 made by dissolving 3-68 grs. of good iron wire (harpsichord 

 wire) in nitric acid, and therefore containing 5-26 grs. of per- 

 oxide of iron. The liquid being then treated with excess of 

 ammonia, the precipitate washed, dried and ignited, was found 

 to weigh 5-47 grs.; and deducting 5-26 grs. of peroxide of iron, 

 there remains 0-21 gr. of phosphoric acid, or 0-84 per cent. 



II. Silica and Alkalies.— 1. Alkaline liquid from 50 grs. of 

 ash (A. 2) acidulated with hydrochloric acid and evaporated 

 to dryness ; residue digested in dilute hydrochloric acid, siUca 

 collected on filter, washed, dried and ignited, weighed 1*22 

 gr. = 2-44 per cent. 



2. Filtered solution treated with baryta-water to separate 

 sulphuric and phosphoric acids ; excess of baryta removed by 

 carbonate of ammonia ; filtered liquid evaporated to dryness, 

 and ammoniacal salts driven off by ignition ; the residue con- 

 sisting of chlorides of fixed alkalies, weighed 16 grs. = 32 per 

 cent. 



3. 2-25 grs. of these mixed chlorides dissolved in water and 

 treated in the usual manner with 3f times their v/eight of 

 sodio-chloride of platinum, gave 7*06 grs. of chloride of pla- 

 tinum and potassium, corresponding to 2*157 grs. of chloride 

 of potassium. Now 2-25 : 32 : : 2-157 : 30*68 ; wc have 

 therefore 



