68 



Studies on Solution. 



the initial filling of the cells. It is seen that the absorption increased 

 rapidly as the chemical change progressed. Under such conditions 

 the values of a were perhaps not very accurate. All that could be done 



A 



.2200 



r 



Cr(N0 3 ) 3 mH a O 



A 



.4000 



704 /iji 



Cr 2 (S0 4 ) 3 inH 2 



700 



800 



900 



1,000 



FIG. 25. The A-c Curves for Chromium Nitrate, Chromium Sulphate, and Potassium Per- 

 manganate in Water; the Absorption Curves for Potassium Permanganate in Water. 



was to fill the cells and then make the few necessary measurements as 

 quickly as possible. The A c curves for wave-lengths 744/^u, 764ju/u, 



