簡單chem 問題... [復制鏈接]

如果用electrolysis 去電aqueous NaCl
點會有咩出左來?

2Na+(l) + 2Cl-(l) ---> 2Na(l) + Cl2(g) Eo = -4.08 V

http://www.chem.tamu.edu/rgroup/soriaga/FYC/HTML_Presentation_folder21/sld008.htm

aqueous 唔係解做加水咩..
咁H2O去左邊呢?

Cathode: 2H+   +   2e-   ->   H2
Anode:     2Cl-   ->   Cl2 + 2e-

好似係咁........唔太肯定

引用第2樓卡卡....於2006-06-07 20:51發表的“”:
aqueous 唔係解做加水咩..
咁H2O去左邊呢?

aqueous唔係指有water compound in the equation

只係 physical state 不再是liquid, 而是aqueous 而已

引用第3樓☆小強★於2006-06-07 20:59發表的“”:
Cathode: 2H+   +   2e-   ->   H2
Anode:     2Cl-   ->   Cl2 + 2e-
好似係咁........唔太肯定 [表情]

YES

then based on this two half-inoic equations, write a full balanced equation

咁姐係
aqueous 同molten 有冇分別

引用第6樓卡卡....於2006-06-07 21:07發表的“”:
咁姐係
aqueous 同molten 有冇分別

係phy的property

引用第0樓卡卡....於2006-06-07 19:05發表的“簡單chem 問題...”:
如果用electrolysis 去電aqueous NaCl
點會有咩出左來?

請問係 conc. 定係 dil.

if conc , chloride ion will discharge and become chlorine
if dilute i think hydroxide ion will discharge and become oxygen

if conc.
cathode : H2
anode : Cl2

if dilute
anode:O2 + Cl2 (mainly O2)
cathode:H2

if v. Dilute
anode: O2
cathode: H2

it depends on the concentration of NaCl and the material of electrode

引用第6樓卡卡....於2006-06-07 21:07發表的“”:
咁姐係
aqueous 同molten 有冇分別

aqueous要有H2O , 可以係solid

molten只係溶左佢, 一定係liquid state, 即係你有冇見過d金溶左?

引用第0樓卡卡....於2006-06-07 19:05發表的“簡單chem 問題...”:
如果用electrolysis 去電aqueous NaCl
點會有咩出左來?

明明書就有好詳盡既解釋  

仲有, conc.同dil.出既野係唔同既. 你冇text book咩?

引用第13樓夢冰月天於2006-10-11 18:56發表的“”:
明明書就有好詳盡既解釋   [表情]
仲有, conc.同dil.出既野係唔同既? 你冇text book咩?

舊年form 3 都冇講 今年遲小小會教 sor