Net ionic equations help (1 Viewer)

[Anthrax]

i need some help with working out net ionic equations for these tests

in a prac, we tested an unknown substance. we found the negative ions to be

chloride

and the positive ions to be

calcium and lead(II)

to test for the chloride ions, we reacted it with a couple of drops of silver nitrate solution. and a white precipitate formed, meaning chloride ions

for lead(ii) we added a few drops of potassium ferricyde soln. and i yellow precipitate formed, meaning lead(ii) ions

then for calcium we added 10 drops of 1mol/L sodium carbonate soln, got the fizzing, did flame test, and got red flame, meaning calcium.

now this is the part were i am stuck, i'm really bad at net ionic equations. is it possible for someone to help ?

 

[xiao1985]

first think what is the ppt...
if u add ag no3, and ppt formed, then u deduce cl- is present... so the ppt has to be formed by the cl- and something (cation) u added (namely ag+)
so the net ionic eqn would simply be:

ag+ + cl- -> agcl (s)

try it with the rest... if u form a ppt, and then deduce the presence of some cation/anion, then the cation/anion must react with the original anion/cation, to form the ppt... and then find their charge and write a balanced eqn which ppt forms...