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chemistry people..come in!!

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AS-Girl:
hi people

I got these 2 questions which i couldn't solve...the most important thing i need to know is the way of getting the answer!! so if anyone knows i would appreciate the help

I need the explanation of question 11 and 12!
scaned working out would be preferable hehe


Thanks in advance

Deadly_king:
First you should write the equation showing the solubility of the salt.

In the first case it's Pb2C2O4 -----> Pb2+ + C2O42-

Now you can write the Ksp

Ksp = [Pb2+][C2O42-]

Since mole ratio of the two ions formed is 1:1, we can take it to be :

So Ksp = 2 = 8.5 x 10-9

Now you just have to find the value of . ;)

I'll let you try the 2nd one yourself. If you can't do tell me and i'll try to be clearer :D

AS-Girl:
Thanks deadly king :D

regarding the second question...i followed the same steps
so Ksp= Ag2CrO4------>2 Ag+  +  CrO4 (-2)

ratio moles is 2:1
so what happens next? im stuck here?!!

Amelia:
Ag2CrO4 ---> 2Ag+ + CrO42-

Solubility of CrO4 = 3.2x10-5
Solubility of Ag+ = 2 x 3.2x10-5

Ksp = [Ag+]2 [CrO4]
Ksp = (2 x 3.2x10-5)2 (3.2x10-5)
Calculate and you get the answer. :)

AS-Girl:
Thanks Amelia :D :D

idea is cleared..if i got any other question..i'll surely post it here!!

Thanks again :)

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