614 PRACTICAL ORGANIC AND BIO-CHEMISTRY 



BiaFs reagent for 

 pentoses. 



Bromine water. 

 Brucke's reagent. 



Carlettfs indicator 

 (reduced ' phenolph- 

 thaleiri). 



EsbacKs reagent. 

 Fehlings solution. 



Poling uranium ace- 

 tate mixture (uric 

 acid). 



Formalin. 



Glyoxylic acid solu- 

 tion. 



Guaiacum tincture. 

 Gunzbergs reagent. 



Harrison's indicator. 



Hydrogen peroxide. 

 Iron alum solution 



(sat.). 

 Ling and Rendle's 



indicator. 



Magnesia mixture. 



Magnesium sulphate 

 solution (sat.]. 



i gm. orcinol is dissolved in 500 c.c. of 30 per cent. 



HC1 to which 30 drops of 10 per cent, ferric chloride 



have been added. 



25 c.c. bromine in 1000 c.c. water. 

 5 o gm. potassium iodide in 5 oo c. c. water are saturated with 



mercuric iodide (120 gm.) and made up to i litre. 

 i gm. of phenolphthalein is boiled with 10 gm. of 



KOH and 5 gm. of zinc dust and sufficient water 



till it is colourless. The solution is made up to 



100 c.c. and kept in a yellow bottle. 

 10 gm. picric acid) are dissolved in water and made up 

 20 gm. citric acid / to i litre. 



Equal volumes of A and B. 



A. 69*28 gm. copper sulphate are dissolved in water 



and made up to i litre. 



B. 346 gm. Rochelle salt (NaK) ,. . , . 



tartrate) ' are dlssolved m water 



130 gm. caustic soda J and made U P to ' litre ' 



500 gm. ammonium sulphate] are dissolved in 650 c.c. 



5 gm. uranium acetate V water. The volume is 



6 c.c. glacial acetic acid J about i litre. 

 Commercial 40 per cent, solution of formaldehyde. 



10 gm. magnesium powder are covered with water; 

 250 c.c. sat. oxalic acid solution are added slowly, 

 and the solution kept cool. The magnesium oxalate 

 is filtered off and the solution is acidified with acetic 

 acid and made up to i litre. 



1 gm. of guaiacum is dissolved in 100 c.c. alcohol. 



4 gm. phloroglucin^are dissolved in 100 c.c. absolute 



2 gm. vanillin J alcohol. 



A pinch of starch is boiled with a few c.c. of water and 

 to it is added 100 c.c. of freshly prepared 10 per 

 cent. KI solution. This solution does not keep 

 for more than 2 or 3 hours. 



10 vols. commercial. 



300 gm. iron alum in i litre water. 



15 gm. ammonium thiocyanate^are dissolved in 10 c.c. 

 i'o gm. ferrous ammonium sul- j- water at 45 and im- 

 phate J mediately cooled. 



5 c.c. cone, hydrochloric acid are then added. 



The solution has usually a brownish colour and is de- 

 colorised by adding a small quantity of zinc dust. 

 This .must be repeated after some time. The 

 indicator loses its sensitiveness if decolorised too 

 often. 



55 gm. magnesium chloride } ,. 



, , -j are dissolved in water 



70 gm. ammonium chloride > , 



/ oo v land made up to i litre. 



125 c.c. ammonia (sp. gr. -880) J 



600 gm. cryst. magnesium sulphate are dissolved in 

 water and made up to i litre. 



