OH- and Cl-

2007-11-30 4:24 am

我地都知啦，Cl-係chlorine既ion form，而且好stable…

而OH-呢，O同H都有Octet structure，都叫stable啦﹗

咁我既問題就係，既然2者各有octet structure，咁點解OH-可同H+ REACT　但係Cl-就唔

得呢？ (意思係點解OH-係STRONG BASE，但Cl-係 WEAK BASE？)

更新1:

多謝第一位的人士答題，不過想你澄清 1：點解你得OH-佢唔stable？ 2：你話Cl- has the structure 1s2 2s2 2p6 3s2 3p6 4s2 ，係冇4s2… 而且Cl-係有3對lone pair，照計佢都有electron-donating property 3：OH-同Cl-都有full filled sub-shell，咁點解OH-好易比到lone pair，但Cl-又唔係咁得？所以，你係冇直接答到我既問題。

回答 (2)

不願透露自己姓名的無名氏一個

2007-11-30 4:52 am

✔ 最佳答案

1/ OH- is not a stable compound. strong base means the compound has a great tendency to accept proton(H+).

2/ H doesn't have an octet structure, i.e. it doesn't have a 8e- shell.

3/ Cl- has the structure 1s2 2s2 2p6 3s2 3p6 4s2 (I'm not sure if you have learnt this, anyway, it means that all its subshells have been fulfilled except the 3d orbital. Therefore ion state is more stable than its original state.)
therefore, Cl- ion is a weak base as it doesn't tend to lose e- to form bond with proton.

4/ on OH- ion, there're lone pairs of electrons on the O atom, which give the compound an electron-donating property to form bond with cation.

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furuta027

2007-12-09 8:44 am

我都係估下....當交流下.....
Cl-既離子體積遠比OH-大

而Cl-同H+既鍵長較OH- 長....
所以Cl-H會較易斷裂.....

所以Cl-係較差既base
==================
相比同一group
鹼性都係I->Br->Cl-
我諗呢個係其中一個原因~
=======================
當然想確定就問pro d既人.....
係呢度(包括我)十之八九都係門外漢.....

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