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AQA Chemistry EMPA 2014

I have the practical tasks tomorrow, can anybody give me any advice? I'm assuming a titration and group 2/7 test. I know how to set out a titration table, but my results aren't always fully accurate. Also with the test tube tests, are you told what chemical you're testing for, or is it unknown (labelled substance X for example).

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Reply 1
Avatar for skittels
skittels
You'll know on the task. If its a powder you got to convert it to a solution watch on utube.
Also the table
how do u read a inital burette reading and what is meant by titre?
Reply 2
Avatar for skittels
skittels
You'll know on the task. If its a powder you got to convert it to a solution watch on utube.
Also the table
how do u read a inital burette reading and what is meant by titre?
Reply 3
Avatar for prophetkid
prophetkid
OP
17
Initial reading is the number on the burette before you start the titration. The final reading is the number after you finished the titration. The titre is the actual volume you needed to neutralise, which is the difference between the initial reading and final reading.
So if your initial reading was 0 (filled to top of burette), and the final reading is 24, then the titre is 24.
Reply 4
Avatar for whizzy1
whizzy1
Original post by prophetkid
Initial reading is the number on the burette before you start the titration. The final reading is the number after you finished the titration. The titre is the actual volume you needed to neutralise, which is the difference between the initial reading and final reading.
So if your initial reading was 0 (filled to top of burette), and the final reading is 24, then the titre is 24.


how was the practical and what did it consist of?
Reply 5
Avatar for prophetkid
prophetkid
OP
17
Original post by whizzy1
how was the practical and what did it consist of?


Turns out I have it tomorrow, my teacher hinted that it was a standard solution which you titrate, then a series of basic test tube tests for anions.
Reply 6
Avatar for prophetkid
prophetkid
OP
17
Original post by whizzy1
im aware of it being an investigation of an iron compound by means of titration with potassium manganate (VII) in acidic conditions
and then some sort of metal salt solution exercises


when is you written paper?


It's next week on Thursday, 8th May.
Reply 7
Avatar for whizzy1
whizzy1
Original post by prophetkid
It's next week on Thursday, 8th May.



so your practicals tomorrow and your written papers on the 8th?
why are they so far apart and are you 100% sure?
Original post by whizzy1
so your practicals tomorrow and your written papers on the 8th?
why are they so far apart and are you 100% sure?

My practical was on the 14th of April and my written paper is on the sixth. are they supposed to be this far apart?
Reply 9
Avatar for whizzy1
whizzy1
Original post by darkdrifter10
My practical was on the 14th of April and my written paper is on the sixth. are they supposed to be this far apart?


they vary from school to school i think, like mine's the total opposite. Both the practical and written are a day apart on the 8th and 9th
Original post by whizzy1
they vary from school to school i think, like mine's the total opposite. Both the practical and written are a day apart on the 8th and 9th


I think it's to allow time to revise, and to fit in with timetables. My biology practical was three weeks ago, and I don't have the written until this Friday.
Original post by darkdrifter10
Hi, my empa written test is on the 6th. what sorts of questions do you thing theyll ask and what calculations should we expect to get.


I reckon they'll ask to work out moles etc, and maybe ask for the moles in a different volume of acid than what you used. They might give a different reaction and you're asked to work out moles/concentration etc. With the test tube tests, they'll probably ask you to identify the substance, and ask about what caused your results to turn a certain colour.
Original post by prophetkid
I reckon they'll ask to work out moles etc, and maybe ask for the moles in a different volume of acid than what you used. They might give a different reaction and you're asked to work out moles/concentration etc. With the test tube tests, they'll probably ask you to identify the substance, and ask about what caused your results to turn a certain colour.

will the empa just be about content covered in group 2 and 7, or will it include other topics like alkenes etc
Original post by darkdrifter10
will the empa just be about content covered in group 2 and 7, or will it include other topics like alkenes etc


You should have been given a list of topics to revise for it which AQA set, all those topics should come up.
I think they are
-group 2
-group 7
-amount of substance
-alcohols
-alkenes
-energetics
Original post by prophetkid
You should have been given a list of topics to revise for it which AQA set, all those topics should come up.
I think they are
-group 2
-group 7
-amount of substance
-alcohols
-alkenes
-energetics

Thanks a lot, my teachers are useless, they havent told me anything regarding the empa
Reply 15
Avatar for noddy95
noddy95
2
Is this thread for A2 or AS?
Original post by noddy95
Is this thread for A2 or AS?

AS
Original post by prophetkid
Turns out I have it tomorrow, my teacher hinted that it was a standard solution which you titrate, then a series of basic test tube tests for anions.


I've got my practical tomorrow morning as well haha
Original post by prophetkid
Turns out I have it tomorrow, my teacher hinted that it was a standard solution which you titrate, then a series of basic test tube tests for anions.


how did it go?
does anyone know if we get our papers back from the actual practical to use in the written bit? because I've made a mistake and I've just realised :frown:

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