Qualification > Sciences
Chemistry Practical
xXFaKeXx:
Yes i do remember dat test. I just scored 29.5 on 40.
Ghost Of Highbury:
--- Quote from: @d!_†oX!© on October 26, 2009, 05:41:46 am ---adi see...u didn't get my question i think
according to the markscheme there is effervescence
and u r getting a yellow ppt cuzz of the potassium iodide dt u hv added nd not in d salt
and about the anions....i know dt it is carbonate [effervescence ]
but how do we find the cation???
there is no test for lead in the notes given to us by CIE
and acc. to d ms...the salt is lead carbonate..bt i dont understand how????
that's exactly my question fakex
--- End quote ---
ok..1st...potassium iodide is not YELLOW!!..it is WHITE in color..
u do no get the yellow ppt because of the potassium iodide..
2nd. i aint appearing for this exam..i am writing chem/6..but still..i think ewn u heat C...a white ppt and ____carbonate is left...
wen u leave the tube to cool..it appears black/grey (possibly)...and lead carbonate is also grey...but i'm still not 100% sure.
@d!_†oX!©:
--- Quote from: | am | on October 26, 2009, 05:49:38 am ---ok..1st...potassium iodide is not YELLOW!!..it is WHITE in color..
u do no get the yellow ppt because of the potassium iodide..
2nd. i aint appearing for this exam..i am writing chem/6..but still..i think ewn u heat C...a white ppt and ____carbonate is left...
wen u leave the tube to cool..it appears black/grey (possibly)...and lead carbonate is also grey...but i'm still not 100% sure.
--- End quote ---
@ adi
1st...i know potassium iodide is WHITE....wat i said is that wen u add it to th solution...the IODIDE ions in d sol. give the YELLOW ppt...
2nd....i knw ur not appearing for p5....nd i think u might be right at this
but is there anyone who is damn sure of any answer????
@fakex...oh yeah...al of us did badly in it man!!!
Ghost Of Highbury:
--- Quote from: @d!_†oX!© on October 26, 2009, 05:54:00 am ---@ adi
1st...i know potassium iodide is WHITE....wat i said is that wen u add it to th solution...the IODIDE ions in d sol. give the YELLOW ppt...
2nd....i knw ur not appearing for p5....nd i think u might be right at this
but is there anyone who is damn sure of any answer????
@fakex...oh yeah...al of us did badly in it man!!!
--- End quote ---
okk..cool..maybe some1 can correctly answer it..
@d!_†oX!©:
--- Quote from: | am | on October 26, 2009, 05:56:11 am ---okk..cool..maybe some1 can correctly answer it..
--- End quote ---
thanks for trying though!!! :) :)
plsss some1!!!!come to our rescue!!!!!! :P
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