1) 正常會將
metal + dilute hydrochloric acid → metal chloride + hydrogen gas
(K - Pb ) M + HCl → MCl + H2
metal + dilute sulphuric acid → metal sulphate + hydrogen gas
(K - Pb ) M + H2SO4 → MSO4 + H2
↓咁如果↓
metal + dilute nitric acid → ?
M + HNO3 → ?
2) 為什麼通常不會用dilute nitric acid？
3) 為什麼不會( metal + concentrated acid )?
聽說好像和 oxidizing properties 有關。
oxidizing properties又是什麼？
4) 如果真的將
metal + concentrated hydrochloric acid → ?
M + HCl →
metal + concentrated sulphuric acid → ?
M + H2SO4 →
metal + concetrated nitric acid → ?
M + HNO3 → ?
會出什麼？
metal + acid → ?
2008-10-16 8:44 am
回答 (2)
2008-10-17 2:11 am
✔ 最佳答案
1) Normally, if metal is added to a dilute acid (eg HCl or H2SO4), the reaction is: M ＋ H＋ → M＋ ＋ H2
However, the case is different in HNO3.
For very dilute HNO3 (0.1 M), the equation is the same as above.
For bench dilute HNO3 (2 M), though, the reaction becomes:
M ＋ HNO3 → M＋ ＋ NO ＋ H2O
As you see, HNO3 has become an oxidising agent.
2) We study acids first by learning the most general properties of them.
Since bench dilute HNO3 does not show the usual property the other acids does towards metals (see above), HNO3 is often discussed separately.
3) Some acids, when in a high concentration, tend to attract electrons readily. This way they have become oxidising agents. You may find that some acids actually appear in the Electrochemical Series. As this differs from the usual acid properties, this is not discussed.
Also, carrying out this reaction can be extremely dangerous, as concentrated acids are corrosive.
4) M ＋ conc. H2SO4 → M＋ ＋ SO2 ＋ H2O
M ＋ conc. HNO3 → M＋ ＋ NO2 ＋ H2O
Conc. HCl, being non-oxidising, behaves the same as dilute HCl.
Hope these help you.
參考: I recalled these from my F5 Chemistry book. Hope there aren't any mistakes.
2008-10-18 3:00 am
1+2.好似會出其他野,例如NO2
3. conc. acid會出SO2,NO2等,危險,因為oxidizng power強
4.會爆炸
3. conc. acid會出SO2,NO2等,危險,因為oxidizng power強
4.會爆炸
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