Salt bridge問題~

有一個cell,一邊就用acidified potassium permanganate solution做electrolyte,
另一邊就用potassium iodide solution做electrolyte:中間加一條salt bridge soaked with
potassium nitrate solution .

問題:Explain whether a sodium sulphite solution can be used instead of
a potassium nitrate solution in the salt bridge.

答案:no,sodium sulphite solution can be oxidized by permanganate ion

點解NaSO3會比MnO4- oxidized?

如果兩邊改用MgSO4 and Zn(NO3)2, salt bridge soaked with NaCl,
咁點解 sodium chloride 唔會比 sulphate ion oxidized