Qualification > Sciences
Chemistry Practical
Ghost Of Highbury:
--- Quote from: @d!_†oX!© on October 26, 2009, 05:28:37 am ---why iodide????
there is no yellow ppt...
--- End quote ---
lead iodide...(yellow)
xXFaKeXx:
It has to be carbonate bcoz of the fizz produced on de addition of an acid.
But where da hell did lead come frm!!!!!!!
@d!_†oX!©:
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
xXFaKeXx:
Okay here's da test for lead>>>>
a)Add dilute sodium hydroxide solution to a solution of the substance. White precipitate, that does dissolve as more sodium hydroxide is added.
b)Add dilute ammonia solution to a solution of the substance. White precipitate that does not dissolve as more ammonia is added.
Whereas NaOH and NH3 solution hav nt even been used in the question!
@d!_†oX!©:
even i know the test now....i saw it in the A levels section sm1 had posted it
bt again nothing of this sort has been done!!!!!
what to do??? :o
fakex do u remember this is the same question that cam for our preboards...
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