CC. ALC. TO ppt, 
15 
WaOH O15 M 
0 J 2 M 
NazSO: —?> 
Fig. 2. Curves showing the effect of increasing concentrations of 
NaSO, (abscissee) on the alcohol number of gelatin plus NaOH 0.015 m, 
HCl 0.013 m, and water (dotted line). The proportions of SO, to H at the 
minimum of the HCl curve are 100: 30. Na,SO, is antagonistic to HCl 
but not antagonistic to NaOH in small concentrations. (See Table II.) 
TABLE II. 
Effect of NazSOx4 on the Alcohol Number of Gelatin plus HCl and NaOH. 
ce eaten Ce. alcohol to precipitate in gelatin plus 
NazSOs. 
H20 HCl, 0.013 m NaOH, 0.015 m 
M 
0.5 
0.25 
0.125 
0.0625 
0.0312 
0.0156 
0.0078 
0.0039 
0.00195 
0.00097 
0.00048 
0.0 
et he 
J" Oy Cd Sr Or oo CO SS © corey 
oS pS Ee toc Se 
ee 
He A NOS BO [Ou GG BS 00 Cyc Or 
Or 
OOF WFrFONNWEHE OH 
3 per cent gelatin C which stood over night at 26°C. before adding 
alcohol. Gelatin C is not so pure as gelatin B. Other details as in Table 
I. (See Fig. 2.) 
444 
