It's was during our Chem Prac...
So, one of our experiment is testing 4 appearance of Pb+ ion in solution...
Firstly, we pour some solution which contain Pb+ into a boiling tube,
and add same amount of I- solution into the same tube...
Pb+ + 2I- ------> PbI2
The rxn is very fast and u will get a yellow ppt....
Yellow ppt form in boiling tube...
So, tis not the end yet...
Wat is another interesting thing about tis yellow ppt is that when u heat it up,
it will disappear,
but when the solution cool down,
it will reappear again...
(act is Pb+ salt will only dissolve in hot water, but not in cold water...)
So, Heat up...
Yay, it's disappear ady...
In order to cool it down faster,
I put it into a beaker with tap water...
After a while,
u will c some shiny shiny yellow or golden ppt started to form in the boiling tube...
N one of my frnz said "Wow, it's gold!? Maybe we can sell it to earn some profit... Hehe..."
Without flash...
With flash...
After that, we filter it out with filter paper n let it dry....
Nice shiny golden salt on filter paper...
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