Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
elemis:
--- Quote from: Shooting Star on June 05, 2010, 09:46:03 am ---need help with s09 q5b...
--- End quote ---
--- Quote from: mohit1234 on June 03, 2010, 09:38:11 am ---no problem.. ;)
anyways
the vol. of phosphate soln used in cm3 is half the height of the ppt in mm
also at 8cm3 all the soln is used up. tht is because adding more does not increase the height of the ppt meaning there was no further reaction on adding more.
also the formula is T3(PO4)2-----because
u take it as 12cm3 of T nitrate react with 8cm3 of sodium phosphate (thts wen all the reactants r used up)
so.....12:8...simplify it
12:8
6:4
3:2
and therefore u get T3(PO4)2
--- End quote ---
nid404:
--- Quote from: Ari Ben Canaan on June 05, 2010, 09:45:51 am ---This is AN OLDDDDDD paper with a teacher MS that says Hydrogen and Chlorine are produced.
--- End quote ---
Ohkay.
I just went through my collins text
It says
In an aqueous solution...both positive ions will go to the cathose but only the H+ ion is discharged as H2
similarly both negative ions go to the anode but only the Cl- ion is discharged as Cl2
elemis:
So when they say just aqueous we assume its concentrated and hence OH- ions WILL NOT be discharged at the anode ?
Instead Cl- will discharge ?
nid404:
That's what the book says :-\
If you find a similar question, it'll be easier to compare and check if they ALWAYS mean aqueous=conc
elemis:
--- Quote from: nid404 on June 05, 2010, 10:00:35 am ---That's what the book says :-\
If you find a similar question, it'll be easier to compare and check if they ALWAYS mean aqueous=conc
--- End quote ---
in 2009 there was a similar question but they were specific about it being CONCENTRATED aqueous.
Thanks Nid ;)
+rep
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