TO Gooch and Heath — Iodometric Determination of Copper. 



cuprous iodide in a volume of 50 cra3 of a neutral solution con- 

 taining 0*2 grm. of copper ; and upon 5 grm. as the amount of 

 potassium iodide suitable in neutral solutions having a volume 

 of 100 em3 . 



We have now to study the effect of free acid upon potassium 

 iodide. 



Table III. 



Effect of Acids upon Potassium Iodide. 



Copper 



KI 



Acid 



Volume 



equivalent 

 to I set free 



grm. 



cm 3 

 H,S0 4 

 cone. 



cm 3 



grm. 



2 



1 



50 



0-0002 



2 



2 



50 



0-0005 



o 



3 



50 



0-0007 



2 



5 



50 



0-0019 



5 



1 



100 



0-0002 



5 



2 



100 



0-0002 



5 



3 



100 



0-0002 



5 



5 



HC1 



cone. 



100 



0-0014 



2 



1 



50 



0-0002 



2 



2 



50 



0-0003 



2 



3 



50 



0-000G 



2 



5 



50 



0-0016 



5 



1 



100 



0-0002 



5 



2 



100 



0-0002 



5 



3 



100 



0-0002 



5 



5 



HN0 3 



cone. 



purified 



100 



0-0008 



2 



1 



50 



0-0025 



2 



2 



50 



0-0094 



2 



3 



50 



0-0230 



5 



1 



100 



0-0002 



5 



2 



100 



0-0002 



5 



3 



100 



0-0002 



5 



5 



HC0H3O2 

 50£ 



100 



0-0294 



2 



25 



50 



0-0002 



5 



25 



100 



0-0002 



5 



50 



100 



0-0003 



