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991925
Username: 991925

Registered: 04-2003
Posted on Sunday, March 07, 2004 - 02:19 pm:   
Heavy metal 會影響environment

那，為什麼用hydroxide，而不用carbonate?

兩種都會form ppt吧？
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991925
Username: 991925

Registered: 04-2003
Posted on Sunday, March 07, 2004 - 02:26 pm:   
Next question

到底是有沒有Cu+？CuOH？
我的solution中有，可是我們沒有學過→吧？
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Wing
Username: 991925

Registered: 04-2003
Posted on Sunday, March 07, 2004 - 03:01 pm:   
啊啊，還有！

現在用的soap是acidic(pH5.5)，可是solution中的是alkaline的？那麼到底哪個對？
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991035
Username: 991035

Registered: 04-2003
Posted on Monday, March 29, 2004 - 09:50 pm:   
Cu+ 係有嫁,仲係紅色 tim
其實可以話未學過,
但係o係 bio,
Benedict's solution is blue in colour,
which contain Cu2+ ion,
when reducing sugar reatc with it,
Cu2+ will reduce to become Cu+ (red)

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Chio U Kim
Username: cuk

Registered: 04-2003
Posted on Saturday, April 03, 2004 - 07:57 am:   
copper(I) oxide is brick red. It is not required in certificate-level Chemistry!

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