VISCOSITY 



217 



ion concentration shows no maximum as does the swelling. Hence 

 we should expect that the more acid is added to a 0.5 per cent 



CQ 



o 

 o 



CO 



3.3 

 3.2 

 3.1 

 3.0 

 2.9 

 2.8 

 27 

 2.6 

 2.5 

 2.4 

 2.3 

 2.2 

 2.1 

 2.0 

 1.9 

 1.8 

 1.7 

 1.6 

 1.5 

 1.4 



FIG. 59.- 

 an increase 

 at 20C. 



1 I I L 



J L 



Influence ^ 



the rise in viscosity of 

 1% gelatin chloride 

 solution of pH 3.4 on 

 standing at 20 C. 



5 10 15 20 25 30 35 40 45 50 55 60 



Time in minutes 



-Showing that concentrations of Na 2 SO 4 of M/32 and above cause 

 in the viscosity of gelatin chloride solution of pH 3.4 on standing 



solution of isoelectric gelatin the less the viscosity will increase 

 on standing at a given temperature, e.g., 20C., since the more 

 acid is added to isoelectric gelatin the greater the tendency of 



