263] 



CHEMICALS AND REAGENTS 



79 



more water added from time to time to make up for evapo- 

 ration, or preferably the bath is fitted with a constant level 

 water-supply. 



i steam- oven (fig. 14) made of copper. The water 

 should two-thirds fill the oven, and should be kept just 

 below boiling. The loss by evaporation should be made 

 good from time to time, if not fitted as described above. 

 CHEMICALS AND REAGENTS 



263. In the following lists will be found the reagents 

 and test substances required in the course. In the first 

 column stands the name ; in the second the chemical 

 formula of the substance. The subsequent columns give 

 directions for their preparation for laboratory use. 



264.— Reagents required for each Bench 



Name 



Formula 



Weight of solid 



in grams to be 



dissolved in one 



Winchester of 



water 



(2,500 c.c.) 



Sulphuric acid .... 

 Hydrochloric acid . . 



Nitric acid 



Acetic acid 



Ammonium chloride . . 

 Ammonium hydrate . . 

 Ammonium sulphide . . 

 Ammonium carbonate 



{note 1) 



Ammonium oxalate . . 

 Potassium hydrate . . 

 Potassium ferrocyanide . 

 Potassium ferricyanide . 

 Sodium phosphate 

 Sodium carbonate 

 Calcium sulphate . 



Barium chloride . 

 Sodium carbonate 



Borax 



Potassium chlorate 

 Test-papers . . . 



H 2 S0 4 . . . 

 HC1 . . . . 

 HNO3 .... 

 HC 2 H 3 2 or HA 

 NH 4 C1 . . . 

 NH 4 HO . . 

 (NH 4 ) 2 S . . 

 (NH 4 ) 2 C0 3 . 



(NH 4 ) 2 C 2 4 .H 2 0, 

 KHO . . . 

 K 4 Fe(CN) 6 . 3 H 2 0, 

 K 3 Fe(CNJ 6 (»*/*2) 

 Na2HP0 4 .i2H 2 

 Na 2 C0 3 .ioH 2 . 

 CaS0 4 . . . . 



BaCl 2 .2H 2 . . 

 Na 2 C0 3 • • . 

 Na2B 4 7 .ioH 2 . 

 KCIO5 . . . . 



300 



400 



100 

 300 

 200 

 200 

 200 

 600 

 Saturated so- 

 lution 

 200 

 Solid 

 Solid 

 Solid 

 Blue and red lit- 

 mus and yellow 

 turmeric-papers 

 in small strips 



3m 

 3m 

 1 m 

 8w 

 3m 

 1 m 

 6 w 



24 w 



8 w 



12 w 



12 w 



12 W 



4W 



