The discoloration of Rhodamine B by electro-generated chlorine at Pt electrode in presence of KCl, follows zero order. So I want to know if this order corresponds to the order of the formation of chlorine at Pt electrode or corresponds to the order of the discoloration of Rhd B? No discoloration in absence of KCl (strong electrolyte used sulfate or nitrate). The discoloration of Rhodamine B by a fresh saturated solution with Cl2 is very fast, so I think it is the order of the electro-generation of Cl2, am I right?
that is, indeed, a tricky question..... I belive and answer with the best of my knowledge..... If the discoloration of rhodamine B follows zero order it must be a catalytical reaction!(?) The chemical reaction order (kinetic and idealized) can`t compared/equilize with an electrochemical reaction (heterogen, current, overpotential, electolyte, solvent, etc...). Kinetics of electochemistry are discriped by Tafel plots and/or Buttler-Volmer-equation (and Frumkin and Markus-Theorie...).....
The discloration of Rh. B by a Cl2-solution is a oxidativ prozess (Cl2 + 2HO- ==> ClO- + cl- + H2O) from the hypochlorite and can not compared to the electrochemical process.....
How is the (order of) discoloration in the absence of KCl at Pt-electrode?? How is the rate of formation of ClO- at a Pt electrode? in water??
Hope my chain of thoughts are not wrong/false....And I did`t overlook something, so I´m curious, what will follow that question/answer.......
And no, I don`t think that it follows the "order of electro-generation of Cl2" (because it is a catalytical process...)
- Badges
- Science topic
- Similar topics
- Chemistry
- Electrochemistry