chemical cell question

2008-09-01 10:48 pm
1.我想問一個要在alkaline medium 才會實行的reaction
(如oxidation of Aluminium Al + 4OH- --->Al(OH)4- + 3e-, 那在H20中會不會有反應
水自己不是會ionize嗎? 那水裹應該有OH-呀....
會不會有一點點reaction?
2.問一個白癡的問題( 我想問那些chemical cell中的electrolyte 怎樣complete the circuit( provide mobile ions) .那些 electrons的流動跟electrolyte有咩關係? 那些electrons只在 external wire 中流動,electrolyte 怎樣幫助(assume: electrolyte 不是gain or loss electrons.

回答 (1)

2008-09-02 2:24 am
✔ 最佳答案
1. 水只會係特定既情況ionize...好似有electrolyte咁..佢就會ionize..因為water同d electrolyte會有attraction force係中間..所以d electrolyte先會soluble係water...咁water就會ionize 水係唔會自己無啦啦ionize...同埋..oxidation of aluminium唔係aluminium同oxygen reacti, 去form層oxide layer咩??

2. 有mobile ion既時候...個electric circuit既negative electrode會比elecroncation去gain electron....而positive electrode就會吸anion既electron..之後d electron就會番番去positive electrode, 咁就會complete左個circuit...而electrolyte係會在aqueous state pass electricity, 即係form ion 既compound...所以佢可以help complete the circuit
參考: myself


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