Chem acid

orb

Distinguish two different acid 有冇乜規則跟
定係唸到乜寫乜

for example: 1M HCl and 1M HNO3

雞

原帖由 ＥnTaＳIa 於 12/6/2008 17:52 發表
Distinguish two different acid 有冇乜規則跟
定係唸到乜寫乜

for example: 1M HCl and 1M HNO3

有乜規則可以跟?
我通常唸到乜就寫乜..

話說 1M HNO3是 極稀. 稀, 定濃?

orb

原帖由 火雞一隻 於 12/6/2008 05:55 PM 發表

有乜規則可以跟?
我通常唸到乜就寫乜..

話說 1M HNO3是 極稀. 稀, 定濃?

對照題目好像要distinguish不需要concentrated or not 的資料-口-
應該算normally diluted

dolphin_ice

係咪chemical test 果類野?
If yes, 冇譜ga wor...

如果係pH就應該有得計
因為HNO3 同 HCl 個 pKa 唔同,
所以同一個molarity個pH會唔同
咁就可以計, 睇下係邊樣 (PS: 你學左咩叫 pKa未?)

鴨

想到有甚麼分別就填啥...
除非它有寫限你用甚麼方法...


兩種的話我現在只想到加silver nitrate....

ben

還有加metal 呢?

鴨

原帖由 ben 於 12/6/2008 11:51 PM 發表
還有加metal 呢?

指明是dilute或是con的話就應該行吧...

現在想想加Bleach也行嘛...
方法應該還有挺多的...
這種問題的答案真的是合理即可...

ben

原帖由 RX78-2 於 13/6/2008 12:05 AM 發表

指明是dilute或是con的話就應該行吧...

1M 嘛*

dolphin_ice

你呢度個 1M 係指 molarity  定 1 個 mole 先? :lol
好多人2樣野都叫左做M :L

Ivanhy92

I think the question is "How toDistinguish two different acidchemically"

Add Cu to both the solutions

Ionic-half equation:

1M HCl : Cu(s) + 2H+(aq) -->  Cu2+(aq) + H2(g)

Colourless bubbles are evolved.

(NO3)- in HNO3(aq) is an oxidizing agent. It will oxidize Cu to Cu2+(aq)

1M HNO3: 3Cu(s) + 2(NO3)-(aq) + 8H+(aq) --> 3Cu2+(aq) + 2NO(g) + 4H2O(l)

NO, nitrogen monoxide is a colourless gas which will react with oxygen to form brown nitrogen dioxide gas.

2NO(g) + O2(g)  --> 2NO2(g)

The only difference is that the gaseous product produced by HNO3 react with O2 in air to form a brown gas.

[ 本帖最後由 arararchchch 於 11/7/2008 11:04 PM 編輯 ]