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Author Topic: Calculate total ion concentration of a potassium oxalate solution  (Read 6329 times)

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mollyp

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Calculate total ion concentration of a potassium oxalate solution
« on: September 01, 2008, 12:12:18 PM »

Hi,
I am having trouble figuring this:

What is the total ion concentration of a 0.43 M solution of potassium oxalate?

K2C2O4 * H20

Can you get me started?
Thanks!
MOlly
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Borek

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #1 on: September 01, 2008, 12:17:59 PM »

How does it dissociate?
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mollyp

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #2 on: September 01, 2008, 01:30:59 PM »

2K+   2C4+  5O2-  2H+

Right?


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LQ43

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #3 on: September 01, 2008, 02:46:14 PM »

2K+   2C4+  5O2-  2H+

Right?




No, polyatomic ions do not decompose into their elements in solution (and neither does water)
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mollyp

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #4 on: September 01, 2008, 03:12:39 PM »

Ok. I am probably overthinking this, but I am totally clueless as to what I need to do to find this. 
Borek, asked me "How does it dissociate?"  Which to me means how does it break into ions.  But, if I have  K2C2O4 + H20  do I have one ion + one water molecule?  I just don't see how to calculate this.
Thank you!
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LQ43

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #5 on: September 01, 2008, 04:45:16 PM »

"How does it dissociate?"  Which to me means how does it break into ions. 

Yes, good

But, if I have  K2C2O4 + H20  do I have one ion + one water molecule? 

Not just one ion but yes there is one water molecule 

An example:
 Li2SO4 dissociates into Li+ (but how many Li+ do you get?) and SO42- . Notice what happens to the polyatomic ion. How many ions are there now?

Now what would happen with potassium oxalate?
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mollyp

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #6 on: September 01, 2008, 05:09:12 PM »

OHHHHHHH!  Yup, I totally did not even think about that oxalate being its own entity...
Ok, so I will have K+ & C2O42-   So I will have 3 total ions, 2 K+ & 1 C2O42-
 
SO,
.43 M x 3mols = 1.3 mols/L

Did I get it?
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LQ43

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #7 on: September 01, 2008, 05:38:36 PM »

Yes  :)
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mollyp

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Re: Calculate total ion concentration of a potassium oxalate solution
« Reply #8 on: September 01, 2008, 06:11:40 PM »

Thank you SO much!  I am so glad I found this site!  I have actually been able to help a few of the people in the High School Chem forum with some of their problems.  Give some, take some!  Fantastic!! ;D
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