為何concentrated HSO4 可以react with unreactive metal?

👨🏻‍🏫 學術台化學

Tom

2007-08-19 10:25 pm

我知道NO3-是一種strong oxidizing agent，在dilute/concentrated的情況下，它會oxdized copper。但SO4(2-)在electrochemical series是高過copper，就算在concentrated的情況下，copper也應該不會變成reducing agent?如果Cu真的轉了electron給SO4(2-)，那麼
SO4(2-)會變成SO2，而Cu就變成CU(2+)，那麼，SO2不就是又會還原Cu(2+)?

真的希望大家幫我一把~

回答 (1)

pha

2007-08-21 5:07 am

✔ 最佳答案

Talking about concentrated sulphuric acid. The reacting species is no longer the sulphate ion, but the whole acid molecule.

Conc. Sulphuric acid is a strong oxidizing agent which can oxidize some unreactive metal including copper. Yes, you are right, SO2 would be formed. However, SO2 would leave the reacting solution as it is a gas actually. So, it will not reduce Cu2+ back to Cu. Also, the reducing power of SO2 is weak.

參考: ME

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