oxidation and reduction

• reduction gaines e-
• oxidation loses e-
• n=c*v , number of moles
• the possible redox reactions occur between the strongest oxidant and the strongest reductant
• • - anode salt bridge cathode+
• role of the salt bridge:

  1- to associate the 2 solutions.

  2- to keep the electroneutrality of the solutions
• emf: E(cell)= E cathode - E anode
• cathode -> highest E˜

  anode -> lowest E˜
• ATS: according to stoichiometry
• anode: oxidation

  cathode: reduction
• cu->cu2+ + 2e- ; oxidation
• zn2+ + 2e- -> zn ; reduction
• redox couples: h2+/h+
• m of anode deceases while m of cathode increases
• e- : anode-> cathode

  I + the ammeter : cathode -> anode
• cu2+ : oxidant

  cu : reductant
• E~(h2+/h+)= 0v
• undergo an reduction : oxidant
• undergo an oxidation: reductant