F4 chemistry [復制鏈接]

e~

考完al同ce chem果d都唔記得哂?

下面是引用超迪仔於2006-05-10 00:21發表的:
e~
考完al同ce chem果d都唔記得哂? [表情]

yes

p.s. i've only taken ce chem, not al

下面是引用kylau於2006-05-10 00:27發表的:
yes
.......

岩岩考完果d都唔清楚咁既~

.....................the concept of this question is just in CE level

however...as we don't know the position of the
half equation : SO42- + 2H+ + 2e- <=> SO32- + H2O in ECS even I have check the
ECS in the AL standard books

Thus I'm not sure for the answer........

My answer base the following ECS(just guess)
O2 + 2H2O + 4e- <=> 4OH-
SO42- + 2H+ + 2e- <=> SO32- + H2O
Fe3+ + e- <=> Fe2+

下面是引用萊斯特於2006-05-09 23:42發表的:
....
a)
cathode:
Fe3+   ---->   Fe2+
anode:
.......

Overall
SO3 2- + 2Fe 3+ + H2O --> SO4 2- + 2Fe 2+ + 2H+