CHEM IONIC EQUESTION2

ho yee

2007-02-17 5:21 am

write an ionic equation for each of the following reactions

(1) iron(II) chloride reacts with dilute nitric acid

(2) magnesium reacts with hot concentrated nitric acid

plx ans step by step

thank you very much!!!

回答 (2)

Uncle Michael

2007-02-17 9:55 am

✔ 最佳答案

(1)
The reducing agent is Fe2+(aq) ion, which is oxidized to Fe3+(aq). The half equation is :
Fe2+(aq) → Fe3+(aq) + e-(aq) .... (*)

The oxidizing agent is dilute HNO3, which is reduced to NO(g). The half equation is :
4H+(aq) + NO3-(aq) + 3e- → 2H2O(l) + NO(g) .... (**)

3 x (*) + (**), the overall equation is got,
3Fe2+(aq) + 4H+(aq) + NO3-(aq) → 3Fe3+(aq) + 2H2O(l) + NO(g)

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(2)
The reducing agent is Mg(s), which is oxidized to Mg2+(aq). The half equation is :
Mg(s) → Mg2+(aq) + 2e- .... (#)

The oxidizing agent is concentrated HNO3, which is reduced to NO2(g).
2H+(aq) + NO3-(aq) + e- → H2O(l) + NO2(g) .... (##)

(#) + 2 x (##), the overall equation is got,
Mg(s) + 4H+(aq) + 2NO3-(aq) → Mg2+(aq) + 2H2O(l) + 2NO2(g)

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yuen chi

2007-02-17 7:55 am

1.3Fe2+ + NO3- + 6H+ ---------->Fe3+ +NO +3H2O
2.Mg + 2NO3- + 4H+ --------> Mg2+ +2NO2 +2H2O

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