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Topic: Ksp Problems  (Read 38521 times)

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Offline AWK

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Re: Ksp Problems
« Reply #15 on: March 28, 2008, 03:21:26 AM »
Quote
3.  The solubility product constant for Strontium Chromate is 3.6x10^-5.  What is the solubility in g/100mL

MW=204
Ksp=[Sr][CrO4]=x^2
x^2=3.6x10^-5
x=6x10^-3=M
g/L=(6x10^-3)(204)=1.224)(.1L)/(100mL)= 1.224x10^-4 g/100mL

should be 0.12 g !
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Gravemind

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Re: Ksp Problems
« Reply #16 on: March 28, 2008, 08:12:47 AM »
I have a strong feeling g/L=(6x10^-3)(204)=1.224 is correct, which would make my dimensional analysis wrong.

g/L to g/mL       (g/L)(L/mL)=g/mL

(1.224g/L)(.1L/100mL)=1.22x10^-3

I must be missing something, because everything looks right



Offline Borek

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Re: Ksp Problems
« Reply #17 on: March 28, 2008, 08:32:48 AM »
(1.224g/L)(.1L/100mL)=1.22x10^-3

This is g/mL, you are asked for something else.
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Offline AWK

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Re: Ksp Problems
« Reply #18 on: March 28, 2008, 10:03:02 AM »
g/L is OK
100 mL comtains 10 % of this quantities
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