Chorine and calcium oxide

well, i bet there IS reaction.

calcium oxide is a strong base.
now, think of reaction between chlorine and strong base...
sodium hydroxide + chlorine
------> sodium chloride + sodium hypochlorite + water
2NaOH + Cl2 ------> NaCl + NaOCl + H2O

there's disproportionation reaction, turning elemental chlorine into chloride (ON = -1) and hypochlorite (ON of Cl = +1).

now, if sodium hydroxide is replaced by calcium hydroxide...
2Ca(OH)2 + 2Cl2 ------> Ca(OCl)2 + CaCl2 + 2H2O
calcium hypochlorite and calcium chloride and water are produced.

and, calcium hydroxide is made from calcium oxide and water:
2CaO + 2H2O ------> 2Ca(OH)2 (i leave the coefficient 2 for easy comparision)

now, combine these two...
2H2O + 2CaO+ 2Cl2
------> 2Ca(OH)2 + 2Cl2
------> 2H2O + Ca(OCl)2 + CaCl2

canceling the water, we have
2CaO + 2Cl2 ------> CaCl2 + Ca(OCl)2


thus, calcium oxide and chlorine actually reacts to form calciium chloride, CaCl2 , and calcium hypochlorite, Ca(OCl)2 .


clacium hypochlorite is also a strong oxidizing agent, sometimes used in sterilizing utensils in restaurants. it's quite soluble in water, and is isolable from aqueous solution, unlike sodium hypochlorite (chlorine bleach, cannot be evaporated to dryness). Chinese: 漂白粉.


2011-01-12 20:07:44 補充：
哦? "there IS reaction" = 會發生反應.
我用大楷強調 "is", 是因為原本有另一回答說"沒有反應", 因此我強調 "是有反應的".

2011-01-12 20:15:05 補充：
以我所知, 這個方法沒有名字, 也不一定對.
但是, 我是基於calcium oxide, calcium hydroxide 和sodium hydroxide 化學性質上的近似 (strong base) 而推論出來的.

2011-01-12 20:15:32 補充：
雖然維基不是個嚴格可靠的資料來源, 但calcium hydroxide 和chlorine 的反應卻是有的;
sodium hydroxide 和chlorine 的反應更是會考化學就必讀.

2011-01-14 01:28:57 補充：
what the heck is it related to reactivity series?
not everything are related to it, OK?
this's NOT displacement reaction; instead, it's more-or-less reaction between chlorine and soluble hydroxides:
Cl2 + 2OH(-) ------> Cl(-) + OCl(-) + H2O

2011-01-14 01:29:09 補充：
so as long as the base is strong (usually soluble), reaction can take place.

2011-01-15 01:39:29 補充：
hey, Na(OH)2 and Al(OH)2 ???
i hope it's just slippery fingers.

那麼比起Ca還要再低的reactivity series 的metal hydroxide 會和Cl2 有反應嗎?

2011-01-14 19:43:06 補充：
No, I don't mean that.
Just want to ask whether the metal hydroxide such as Mg(OH)2, Zn(OH)2, Al(OH)2, Fe(OH)2 etc can perform the reaction like Ca(OH)2 and Na(OH)2 etc with Cl2
And now I understand