All Chemistry A2 students, the planning question this summer... Watch

ATESalisbury
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#141
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#141
No probs Nighty, get some sleep, u dnt wanna do practicals with a sleepy head trust me....
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AbzDaDon
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#142
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#142
iv just stuck tiny little book marks all over my practical user guide
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theunforgiven
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#143
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#143
right lads off to sleep now so best of luck to all of u 4 ur practicals toorrow. hope it is a easy one. and thanks everyone for ut help.
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RMIM
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(Original post by AbzDaDon)
iv just stuck tiny little book marks all over my practical user guide
Top idea.
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mambojambo
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#145
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Ok, here's my info for the planning:

Q4: Planning

You are given 3 colourless aqueous solutions of the following compounds:
ZnCl2, AlCl3, NH3
You are provided with AgNO3 solution and no other chemicals or test papers.
a)Plan a series of test to identify each solution
b)Plan a simple procedure to seperate the cations of ZnCl2 and AlCl3 using only these three given solutions

Answer

(IDENTIFYING)
1. Add AgNO3 to each solution
2. ZnCl2 and AlCl3 will form white ppte
3. NH3 will form brown ppte
4. Add NH3 to the remaining two solutions
5. Both solution will give white ppte
6. But, white ppte with ZnCl2 dissolves in excess NH3 to give colourless soln
7. White ppte of AlCl3 insoluble in excess NH3

(SEPERATING)
1. To a solution containing both ZnCl2 and AlCl3, add excess NH3
2. White ppte forms in a colourless solution.
3. White ppte is Al(OH)3 and the colourless solution is [Zn(NH3)4(H2O)2]2+
4. To seperate the cations, filter the ppte using filter paper and Buchner funnel.
5. Residue on filter paperwill be Al(OH)3 and the filtrate in the flask will be [Zn(NH3)4(H2O)2]2+
6. Leave residue to dry


DONE!

Hope this helps those of you who need an example of the full answer.
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Smashingdude
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#146
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Best of luck everyone.
And yeah i think they might give AgNO3. U can anywayz even do the identification without AgNO3. It made life easier a bit.
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har1s
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#147
G0od Luck everyone.. and thanx to all the people who contributed to this thread..!
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nighty
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#148
hey har1s what time is ur exam?
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Jean
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mine is in two hours time!!! Thanks everyone for the great help.. they are indeed very helpful help.
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har1s
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#150
in 2 hours..
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labz
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#151
Thanx every1 4 ur help!!!!!! u've all been excellent

Gd luck every1
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nighty
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#152
goood luck everyone
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Jean
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Life is good! Life is great! Thanks, everyone!!
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mambojambo
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#154
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How was it? What exactly came out? Jean, the paper you did was Group 1 is it?
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"Hurricane"
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POLL: How did you do in your EDEXCEL A2 Chemistry Practicals:
http://www.thestudentroom.co.uk/showthread.php?t=232983
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=Keith=
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#156
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#156
Yeah do tell us how was ur group 1 practical.
And thanks smashingdude... thanks for ur help.
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Smashingdude
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Easiest practical guys. I cudnt believe they gave KCl to identify. And the first one really was Fe+2 ions. Organic was simple. And plan rocked. They made life easier by giving NaOH.
It simply rocked. The boiling point was so damn accurate. My sample must have been 100% pure. It came to exactly 77(77 up, 76.5 down). And my teacher said this was the reading supposed to get,
Awesome paper.
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Mustard-man
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#158
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looks like I'm not going to kill you and your family anymore

What the hell was the primary/secondary alcohol question where you have to distinguish them?

How many marks was the boiling temperature question (the first question where you record)
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ArVi
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(Original post by Smashingdude)
Easiest practical guys. I cudnt believe they gave KCl to identify.
:ditto:

(Original post by Smashingdude)
And the first one really was Fe+2 ions.
My solid and solution were both yellow. Were your's too? Will I lose marks for writing "Possible presence of Fe3+" as the inference for the first question?

(Original post by Smashingdude)
The boiling point was so damn accurate. My sample must have been 100% pure. It came to exactly 77(77 up, 76.5 down).
:ditto: - I got 78 up, 76 down (these values are fine right?) and selected ethyl ethanoate
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Mustard-man
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Yellow????!!??

The solid + water gave a colourless solution (Fe(H2o)6)2+
Add excess NaOH gave an insoluble green ppt. which darkened on exposure to air.
Add H2O2 gave a brown ppt. Fe(II) had been oxidised to Fe(III)
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