[mana]

hi all
in a galvanic pill, when we use a salt bridge, of course, the cations must move to the cathode and the anions go to the anode to keep the solution neutral and help the pill continue working, now my question is which ions exactly migrate? for example the salt bridge contains K⁺ and NO₃^- does these two ions go to cathode and anode half cell exactly and then the salt bridge must lose its ions after the reaction finished (because they have entered to the pill's electrolytes and then it doesn't have ions anymore), or for example in Zn/ Cu galvanic pill, the SO₄^2- and Zn²⁺ from the pill's electrolyte are transferred by a salt bridge to keep the pills neutral?
thanks for your help in advance

[Borek]

All ions migrate - salt bridge loses its ions to both solutions and gets equivalent charges in ions from from the cathode and anode solutions. The idea is that the salt bridge is long enough reacting ions from the half cells won't ever meet.

[mana]

All ions migrate - salt bridge loses its ions to both solutions and gets equivalent charges in ions from the cathode and anode solutions. The idea is that the salt bridge is long enough reacting ions from the half cells won't ever meet.

thank you for your answer, thus you mean that the cation and anion of the salt bridge (for example K⁺ and NO₃^-) and also the cation in anode electrolyte (for example Zn²⁺) and the anion in cathode electrolyte (SO₄^2- in this case) all will migrate, am I right?

[Borek]

Yes.