Marshall. | 478 [April 5, 
Inasmuch as this acid differs from salicylic in having one atom of chlor- 
ine, its antiseptic properties might be enhanced, and owing to its ready 
solubility would therefore render it preferable to salicylic acid. 
An aqueous solution of the acid mixed with ferric chloride gives a beau- 
tiful violet coloration. 
An analysis of the material thus prepared gave the final proof that the 
compound formed was the desired monochlorsalicylic acid. 
1417 germs. dried acid burned with coarse and fine lead chromate gave 
48.13 % carbon, and 3.00 % hydrogen. 
Calculated per cent. Found per cent. 
C, =8t = 48.69% 48.13% 
Mp) 45 = 25899 3.00 % 
Cl = 35.5 = 20.58% 
OF =ASs = 27.84% eed 
171.5 100.00 
SALTS. 
For a more complete recognition of the acid the following salts were 
made and analyzed : 
Barium MONOCHLORSALICYLATE. 
(C, H, Cl OH COO), Ba + 3 H, O. 
Obtained by boiling the aqueous solution of the acid with an excess of 
barium carbonate and filtering. The filtrate upon concentration and stand- 
ing for some time, yielded white, bright, shining crystals of this salt. In 
cold water it is soluble, and when the liquid is warmed the compound dis- 
solves very readily. 
Water Estimation. 
0.2000 Grms. air-dried salt lost upon heating for four hours at 170° C., 
.0200 Grms. H,O = 10.00% H,0. 
The calculated per centage of water for 3 molecules H,O — 10.11%. 
Calculated. Found. 
(C, H; Cl OH COO), Ba = 480 = 89.89 % 
8 HO = bare 10.117, 10.00 % 
534 100.00 
Barium Estimation. 
0.121 Grm. anhydrous salt was placed ina platinum crucible, a few drops 
of sulphuric acid was then added and this evaporated to dryness. .0594 
Grm. barium sulphate were obtained, corresponding to .0349 Grm. barium 
= 28.83 % Ba. 
Calculated per cent. Found per cent. 
-(C, H, Cl OH COO), = 343 = 71.45% 
+ Ba = 137 = 28.55 % 28.83 % 
480 100.00 
