Counting Electrons Coulometry and Faradays Law of Electrolysis

In 1832-1833, Michael Faraday s studies of electrolysis led to this conclusion. 

The amount of substance that undergoes oxidation or reduction at each electrode during electrolysis is directly proportional to the amount of electricity that passes through the cell. 

The elecfrolysis of the aqueous solution of KI, another Group lA-Group 7A salt. At the cathode (/off), water is reduced to H2(g) and DH ions, turning the phenoiphthaiein indicator pink. The characteristic brownish color of aqueous I2 appears at the anode right). 

Electrolysis of water to produce 02(g) and H2(g). Ha2 04 was dissolved in the water to improve the conductivity. Can you identify which tube in this picture is collecting the H2 gas and the name of the electrode producing H (anode or cathode)  

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