關於Fe2+ 同 Fe3+........

Author Message   Chris Law Username: 981161 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 07:50 pm:    我想問97年 Paper2 Q.29: An iron nail is heated with concentrated sulphuric acid. Which of the following combinations is correct? ----Gas given off----Colour of solution formed A:----hydrogen------------pale green B:----hydrogen------------yellow C:----sulphur dioxide-------pale green D:----sulphur dioxide-------yellow 我solution o既答案係#D，我明點解出SO2，但係點解出Fe3+(yellow)而唔係Fe2+(pale green)呢?   Fender Username: 981036 Registered: 04-2003 Posted on Tuesday, May 13, 2003 - 08:10 pm:    conc. H2SO4is a oxidizing agent, it oxidizes fe2+ to become fe3+, and SO2 is given off of coz...check it out from your text book, topic 3---acid & base   小畫家 Username: 981039 Registered: 04-2003 Posted on Wednesday, May 14, 2003 - 10:47 am:    其實佢個iron nail 係唔係先轉 2+ 再去到 3+ 呢?   彭彭等待5月20日來臨....... Username: 981151 Registered: 04-2003 Posted on Wednesday, May 14, 2003 - 01:27 pm:    yes ar