香港寵物小精靈村落 論壇

標題: acid定alkali係上定下既問題.. [打印本頁]
作者: 小霞的fans    時間: 10/5/2009 11:53 AM
標題: acid定alkali係上定下既問題..
the following table shows the experimental results for the titration of 0.10M  nitric acid against 25.0cm^3 of a sodium hydroxide solution.

其實點知邊個係burette邊個係conical flask度 ? against後面果個就係下面?
作者: fish    時間: 10/5/2009 12:17 PM
本帖最後由 fish 於 12/5/2009 09:29 AM 編輯
the following table shows the experimental results for the titration of 0.10M  nitric acid against 25.0cm^3 of a sodium hydroxide solution.

其實點知邊個係burette邊個係conical flask度 ? against後面果 ...
小霞的fans 發表於 9/5/2009 22:53

                               
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這case是NaOH於conical flask 內
burette (buret)中的是known concentration的東東
用字方面....against前面的多數在buret.... 就如plot A(上) against B(下)


另一個方法是25.00mL....能如此準的多半是25.00mL pipet (CE中最common的pipet是25.00mL), 但安全起見看一看問題好了
(此問題是25.0mL,所以看"against好了)
作者: 小霞的fans    時間: 10/5/2009 01:39 PM
這case是NaOH於conical flask 內
burette (buret)中的是known concentration的東東
用字方面....against前面的多數在buret.... 就如plot X(上) against Y(下)


另一個方法是25.00mL....能如此準的多半是25 ...
fish 發表於 9/5/2009 04:17 PM

                               
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喔我明白啦..
有多1條問題..

waste solution discharged from some factories is acidic and contains metal ions that may lead to pollution.

Use copper(II) as an example, suggest how metal ions can be removed from the waste solution.Write an ionic equation for the reaction involved.

其實我唔明條問題問咩-0- ""
作者: 小流＊    時間: 10/5/2009 03:35 PM
喔我明白啦..
有多1條問題..

waste solution discharged from some factories is acidic and contains metal ions that may lead to pollution.

Use copper(II) as an example, suggest how metal ions can be removed from the waste solution.Write an ionic equation for the reaction involved.小霞的fans 發表於 10/5/2009 01:39 PM

                               
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問有工廠既排放物係酸性而且含有金屬離子
用Cu^2+做例子,提議如何消除離子
寫當中的ionic equation

答:add NaOH
Ionic equation:Cu^2+ + 2OH^- ->Cu(OH)2

(應該無錯啦)
作者: dolphin_ice    時間: 11/5/2009 03:47 PM
the following table shows the experimental results for the titration of 0.10M  nitric acid against 25.0cm^3 of a sodium hydroxide solution.

其實點知邊個係burette邊個係conical flask度 ? against後面果 ...
小霞的fans 發表於 10/5/2009 11:53 AM

                               
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"against"之前果個係burette入邊果個.

大多數titration都係acid0係 burette度
因為alkali會"啦"到個burette.
作者: 超夢夢的夢境    時間: 12/5/2009 04:52 PM
這case是NaOH於conical flask 內
burette (buret)中的是known concentration的東東
用字方面....against前面的多數在buret.... 就如plot X(上) against Y(下)


另一個方法是25.00mL....能如此準的多半是25 ...
fish 發表於 10/5/2009 12:17 PM

                               
登錄/註冊後可看大圖

怎麼我記得plot graph是plot y against x...
作者: fish    時間: 12/5/2009 10:29 PM
怎麼我記得plot graph是plot y against x...
超夢夢的夢境 發表於 12/5/2009 03:52

                               
登錄/註冊後可看大圖


我句中的X 跟 Y 只是指任何variable而已
你不說我也沒留意到會令人混淆的可能
我想改為 a 跟 b會好些吧



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