POLL: How did you do in your EDEXCEL A2 Chemistry Practicals:

hey i did the plan a bit differently. i said label the three solutions a,b and c and mix two at a time like a and b, b and c and a and c. the solution that has no ppte will have al and zn and the other solution will be nh3. is this okay?

theunforgiven that is also a correct method. But u had NaOH with u so cud have probably done it the easier way. But ur method was flawless so u will get full marks for it. In MS they will mention different ways/plan to students attempts the questions. So u can go anyway round the plan but it shud be sensible/appropriate and can be done practically with the expected results.

pole substance C did smell like hell. Apart from that, i am sorry to say, iron doesnt give flame tests. It does give colored flames but it changes as it is a transition metal. So they are not characterstics for distinguish as it is for Na and K.
And u dont need a cobalt rod or something like that. u just use a wire, dipped in aq HCl and then rolled in the substance. Then subject it to BLUE bunsen flame(remeber not red. u have to set up the bunsen so it sparks up in blue).
It wud give u straight lilac colour.
Maybe u didnt heat the wire properly or didnt get enough of the substance on the platinum wire. Or u just tried it in brick red flame. Or there is another possibilty that the plaintum wire was dirty so it gave some other colour.
Also the platinum wire has its own charactersitic colour.
But be chill. u will loose only 2 marks if its wrong.

Hi every1 thanx for all the help!

Just wanted to ask:
1. which separation method should be used simple filteration, filteration unde reduced pressure (Buchner) or decanting
2.do you have to add HCl to free the cations at the end?

Thanks - any help appreciated

1.Simple filteration is enough.
2.Zn is already a cation.

Thanx
for part 2. i meant abot the Al 3+ (as it has formed a ppt)

Abburuman i wrote the plan which i said previously expect i used NaOH to distinguish between them first.

primary alcohol and secondary alcohol..

what was the answer for distinguishing them? This was the only question I didn't know

I got the Fehling's solution wrong, it didnt change coloud, so i thought it was a ketone..so my questions for all the following questions are all wrong.

you oxidise the alcohols with acidified potassium dichromate...then add 2,4-DNP..then do silver mirror test....this is a correct way.......but they only gave us one line....i thought it musta bin sumthin short...and i ran outta time to write it...

yeh i jus didnt think...i had like 5 minutes left...but the rest of the paper was wikkid...