3boys2girls » 化學物理生物 » For CE chem Acid(little revision)

2009-3-22 16:16 ZeroYip
For CE chem Acid(little revision)

[size=4]Just for little concept for F4-5 student chemistry about acid
Some of my friends asked me this question again and again
They ask me that what is this reaction mean
H2SO4(aq)+H2O(l)<>H3O+(aq) +HSO4-(aq)………….1
For reaction 1 it is H2SO4(aq) dissolve in water and it will ionized into hydroium ion and HSO4- ion.
And the hydroium ion is the strongest acidic ion which can exist in the water.
So the reaction go reverse.
In my mind for CE you just need to remember the six strongest acid:
Hydrochloric acid:  HCl
Hydrobromic acid:  HBr
Hydroiodic acdi:  HI
sulfuric acid:  H2SO4
Nitric acid:  HNO3
Perchloric acid:  HClO4
These strong acid will have reverse reaction when they put into water.
P.S. if they are in crystal form (s) they don’t have any reaction.
They will have reaction if and only if they are in (aq).

I think in CE level acid will only react with the follow stuff
[color=Red]1) Carbonates[/color]
[color=SandyBrown]2) Hydrogencarbonates[/color]
[color=YellowGreen]3) Metal Oxide[/color]
[color=SeaGreen]4) Metal Hydroxide[/color]
[color=MediumTurquoise]5) Metal[/color]

For Carbonates

Na2CO3(aq)+ H2SO4(aq)>Na2SO4(aq)+CO2(g)+H2O(l)
Ionic equation will be

For any insoluble carbonate
Ionic equation will be

For Hydrogencarbonates

Net ionic equation: HCO3-(aq)+H+(aq)>CO2(g)+H2O(l)

For metal oxide
For soluble oxide
Ion equation: O2-(aq)+2H+(aq)>H2O(l)
P.S. heat will evolved

For insoluble oxide
Ionic equation: CuO(s)+ 2H+(aq)> Cu2+(aq)+H2O(l)

For Metal Hydroxide
For soluble hydroxide
Ionic equation: OH-(aq)+H+(aq)>H2O(l)
For insoluble hydroxide
Ionic equation: Zn(OH)2(s)+2H+(aq)>Zn2+(aq)+2H2O(l)

For metal
Only the metal for K Na Ca Mg Al Zn Fe Pb can react will dilute acid

For concentrated acid
Like H2SO4

Cu(s)+SO4 2-(aq)+4H+(aq)> Cu2+(aq)+SO2(g)+2H2O(l)


Cu(s)+ 2NO3-(aq)+4H_(aq)>Cu2+(aq)+2NO2(g)+4H2O(l)[/size]

let me know when i get it wrong
it is nearly 3:00am in USA now
so sleepy when im typing[/size]

[[i] 本帖最後由 ZeroYip 於 2009-3-22 16:21 編輯 [/i]]

2009-4-20 13:17 m!mosa

2009-4-20 13:51 ZeroYip

2009-4-22 15:15 a902355

2009-4-22 16:11 ZeroYip
i hope you don;t mind i use english to answer ur question

(960cm^3CO2)(1mol/24.0dm^3)(1dm^3/1000cm^3)(1cm^3/1g)(44gCO2/1mol CO2)(1mol CO2/1 mol CaCO3)(1mol CaCO3/100gCaCO3)=0.0176g CaCO3
P.S. Cu=63.5 but question is Ca=.="

2009-4-22 18:19 a902355

2009-4-23 00:10 ZeroYip
it is only the structure for molecular

it is the structure for anion and cation when they mix together

2009-4-23 13:50 a902355

2009-4-24 05:17 ZeroYip
please reopen a new topic ok?
i can explain a little longer in that one

2009-4-24 13:59 ZeroYip
NH4 係當+1
so V係 +1+3(-2)+v=0

好似group 8 佢地就係单原子分子

2009-4-27 22:17 sdfantasy
In CE level, you just need to memorize 3 of strong acids,

Hydrochloric acid, Sulphuric acid and Nitric acid.

And some weak acids,eg: alkanoic acid

In Ce level, when aqueous sulphuric acid is dissolved in water,

complete ionization occurs,The acid will be ionized yo give Hydrogen ions and Sulphate ions

The equation of the reaction mentioned above:

H2SO4(aq) + water -> 2H+  + SO4^2-

[[i] 本帖最後由 sdfantasy 於 2009-4-27 22:20 編輯 [/i]]

2009-4-28 10:19 ZeroYip
O man?
3 strong acid only?
I don't know sry.
anyway i will go back HK to take the CE level and Al level of chemistry to see what grade I can get
where can i go to apply for that?

2009-4-28 15:35 sdfantasy
You can go to HKEAA to apply for that..

ya, 3 strong acid only

2009-4-28 21:50 magiyafeimo
[quote]原帖由 [i]sdfantasy[/i] 於 2009-4-28 15:35 發表 [url=http://www.3boys2girls.com/redirect.php?goto=findpost&pid=38485804&ptid=589755][img]http://www.3boys2girls.com/images/common/back.gif[/img][/url]
You can go to HKEAA to apply for that..

ya, 3 strong acid only [/quote]


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