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

fish

原帖由 Nidoq 於 12/7/2008 13:30 發表

                               
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最common的都寫了...

只好亂寫答案OTL
這個有可能對嗎? (舉手~

AgNO3, CH3COOAg等物更好

AgOH  is unstable at RT.
It exists as Ag2O at RT.

[ 本帖最後由 fish 於 12/7/2008 01:43 PM 編輯 ]

Nidoq

最common的都寫了...

AgOH + HCl → H2O + AgCl

AgCl & AgOH are white jelly-like solid
so no observable change

AgOH + HNO3 → H2O + AgNO3

AgOH dissolves

只好亂寫答案OTL
這個有可能對嗎? (舉手~

Ivanhy92

原帖由 fish 於 11-7-2008 23:06 發表

                               
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Copper will not (or is expected not to) react with HCl.

Oh no! I forgot it. Thx for reminding me about this.

咁仲易,一個有reaction,一個no reaction.

fish

原帖由 arararchchch 於 11/7/2008 23:03 發表

                               
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I think the question is "How to Distinguish two different acid chemically "

Add Cu to both the solutions

Ionic-half equation:

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

Colourless bub ...

Copper will not (or is expected not to) react with HCl.

[ 本帖最後由 fish 於 11/7/2008 11:08 PM 編輯 ]

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 ]

dolphin_ice

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

ben

原帖由 RX78-2 於 13/6/2008 12:05 AM 發表

                               
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指明是dilute或是con的話就應該行吧...

1M 嘛*

鴨

原帖由 ben 於 12/6/2008 11:51 PM 發表

                               
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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

還有加metal 呢?