FURTHER MEASUREMENTS WITH ZINC AMALGAMS. 



41 



NO. 20. 



Weight amalgam No. 2 8.631 

 Weight mercury 19.017 



28.248 



c 2 _ 28.248 13.533 

 " 8.631 



'20 



I3-542' 



NO. 21. 



Weight amalgam No. 2 6.690 

 Weight mercury 12.236 



18.926 



13-533 



log 



Ratio of densities 



= 0.51467. 



13-533 

 13-542 



Ratio of densities 



13-533 

 I3-542 



'21 



I8.026 

 6.69O 



X 



13542 



log-?- =0.45133. 



Potentials of Zinc Amalgams. Fourth Series; Dilute Amalgams. 

 ir of 1-volt cell = 0.9926; t of thermostat = 23.10 C. 



Here might have been inserted the check measurements with standard 

 amalgam, which were just the same. 



The next portion of the curve to be investigated lay beyond the point (5). 

 Amalgam No. 5 was so nearly used up that a new amalgam, No. 22, had to 

 be prepared and bottled in the original apparatus. 



Weight amalgam No. 1 10.50 Correction factor for Zn 1.0016 



Weight mercury 



10.50 

 1 57-54 Ratio of densities 



166.04 



Its concentration in terms of No. 1, 

 c 



I3-464 

 I3-540 



1 



168.04 13.466 K , c , 



x .':... x 1.0015; log = 1.20262. 



10.495 13542 



Concentration referred to No. 3 log i. 1.20637 



C12 



k (1-22) observed 



7r (1-22) corrected 



ir (1-22) international volts 



7r 1-22 (calculated) 



Dtt 



0.03402 

 0.033996 

 0.03374 

 0.03530 

 = 0.00156 



Total ordinate, 0.00156 -f- 0.00001 = 0.00157 



