一個electrolysis內,
oxdation takes place at impure copper rod;reduction takes place at the pure copper rod
eletrolyte係copper(ll) sulphate solution .
點解the blue colour of the copper(ll) sulphate soltion 唔會gradually fades off??
幾時知道the blue colour of the copper(ll) sulphate soltion 會gradually fades off,幾時the blue colour of the copper(ll) sulphate soltion 唔會gradually fades off???
*請用簡單而清楚的中文解答
electrolysis
2007-08-10 9:34 pm
回答 (1)
2007-08-10 9:46 pm
✔ 最佳答案
因為electrolyte入面ge Cu2+ ion會不斷補充..係impure copper rod: Cu -> Cu2+ + 2e-
pure rod: Cu2+ + 2e- -> Cu
mole of Cu2+ generated by impure rod= Cu2+ used in reduction at pure Cu rod
electrolyte 入面的Cu2+ 濃度不變-> 唔會gradually fade off
net equation 係 Cu(s, impure rod) -> Cu(s, pure rod)
會唔會gradually fade off就睇下Cu2+ 濃度會唔會變
呢個case Cu2+ 有補充, 所以唔變
參考: me
收錄日期: 2021-04-20 20:15:26
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