324 REAGENTS. [APP. II 



[Alcohol. 



Alcohol of about 98 p.c. can be obtained from good metliy- 

 lated spirit by distilling two or three times off freshly burnt 

 lime, it should be allowed to stand over the lime for twenty- 

 four hours before each distillation. 



The methylated spirit now commonly sold is useless for 

 this purpose but the 'ordinary methylated spirit,' which is 

 still supplied for manufacturing and scientific work, when 

 treated with lime can be used for all purposes where alcohol 

 not stronger than 98 p.c. is required.] 



Standard Solutions. 



Decinormal Sulphuric acid. 



„ Alkali (baryta). 



,, Potassium permanganate. 



„ Silver nitrate. 



Uranium acetate (1 c.c. = -005 grs. P0O5). 

 Nessler's \ prepared as described 



Ammonium chloride linWanklyn's "Water 



Alkaline potassium permanganate J Analysis." 

 Fehling's. 



Sachsse's (alkaline mercuric iodide). 



Barfoed's (4 grs. cryst. cupric acetate + 1 gr. acetic acid 

 per 100 c.c.) 



Solutions in -water. 



Acids. 



Hydrochloric '\ 



Nitric > (concentrated and 10 p.c.) 



Sulphuric J 



Acetic (glacial and 10 p.c.) 



