重有electrolysis 如果cu 係anode, electrolyte 係cuso4(aq), Cu->Cu2+ +2e- , 但同時 Cu2+ +2e- ->Cu, 個effect cancel out左, Cu metal 個mass remains unchanged
有年past paper chemical cell 係mg in mgso4 solution 做 reducing agent, 因為mg 係strong reducing agent, 佢loses electrons, 之後出mg2+但mg2+ hardly reduced 所以唔會變返mg, mg dissolves.
我想問如果zn anode in znso4(aq), al anode in al2(so4)3係咪同mg 一樣都行唔到
zn2+ +2e- -> zn
al3+ +2e- -> al
zn 同al 都會dissolves and decrease in mass


