查看完整版本 : 大家幫幫手

kennethchan2013 2013-4-4 07:48 PM

大家幫幫手

MnO4- undergoes decomposition:
4MnO4-+2H2O(出)4MnO2+3O2+4OH-
以上條式既half equation係?
可唔可以係electrochemical series表用條斜線估計到條Reaction?
Thx a lot:smile_40:

jmlo 2013-4-4 10:41 PM

The half-equations are:
MnO4− + 4 H+ + 3 e− ----> MnO2(s) + 2 H2O     ..... (1)
2H2O  ----> O2 + 4H+ + 4e-                             ..... (2)

You can obtain the desired MnO4- decomposition reaction by 4*(1) + 3*(2) followed by adding 2OH- on both sides.

kenneth20132013 2013-4-5 10:45 PM

同埋我想知redox reaction有時MnO4-可以出 Mn2+或MnO2 OR S2O32- 可以出SO42-或S4O62-,但題目淨係俾REACTANT,我點知出咩? 萬分感謝:loveliness:
頁: [1]
查看完整版本: 大家幫幫手