F4 chemistry [復制鏈接]

a)Write the overall eqation for the reaction taking place in the cell.

b)Can sodium hydroxide replace the sodium sulphate in the salt bridge? Why?

a) sodium sulphate, Iron(III) chloride

3Na2SO4(aq) + 2FeCl3(aq) -> 6NaCl(aq) + Fe2(SO4)3(aq)


b part i am not sure

下面是引用kylau於2006-05-07 17:54發表的:
a) sodium sulphate?, Iron(III) chloride
3Na2SO4(aq) + 2FeCl3(aq) -> 6NaCl(aq) + Fe2(SO4)3(aq)
.......

ar................It is sodium sulphite and iron(III)chloride

唔記得哂lu~

不過salt bridge唔係剩係for provide ion既咩?用咩都得掛~~

下面是引用lion05hk於2006-05-07 18:53發表的:
ar................It is sodium sulphite and iron(III)chloride

3Na2SO3(aq) + 2FeCl3(aq) -> 6NaCl(aq) + Fe2(SO3)3(aq)

b)Can sodium hydroxide replace the sodium sulphate in the salt bridge? Why?
Sodium hydroxide can't repace the sodium sulphate in the salt bridge because the hydroxide ion will form precipitate with the iron3 ion ( brown or yellow ppt. will be formed)

下面是引用tottileung37於2006-05-09 23:11發表的:
b)Can sodium hydroxide replace the sodium sulphate in the salt bridge? Why?
Sodium hydroxide can't repace the sodium sulphate in the salt bridge because the hydroxide ion will form precipitate with the iron3 ion ( brown or yellow ppt. will be formed)

wow~~
勁~

下面是引用tottileung37於2006-05-09 23:11發表的:
b)Can sodium hydroxide replace the sodium sulphate in the salt bridge? Why?
Sodium hydroxide can't repace the sodium sulphate in the salt bridge because the hydroxide ion will form precipitate with the iron3 ion ( brown or yellow ppt. will be formed)

已經比番晒先生loooo.......

下面是引用kylau於2006-05-08 17:36發表的:
3Na2SO3(aq) + 2FeCl3(aq) -> 6NaCl(aq) + Fe2(SO3)3(aq)

死la
e條咩式黎咖
點解好似唔係redox......

下面是引用萊斯特於2006-05-09 23:30發表的:
死la [表情]
e條咩式黎咖 [表情]
點解好似唔係redox......

係喎，唔洗整half equation既~~~

....
a)
cathode:
Fe3+   ---->   Fe2+
anode:
SO3 2- ---->   SO42-

overall: no time write....later sin

b)SEEMS can't, the hydroxide ion is a stronger reducing agent than SO3 2-
it will undergo redox reaction with Fe3+ and colourless gases will be given----->not sure

half cell 好似唔係咁架.........唔通..........

大獲 orz

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

b)
as OH- move to the anodic half cell to compensate the lose of negative charge,
it replace SO3 2- as the reducing agent----->also not sure....just blow water

我d chem........

a) is redox...