Molar concentration

  • Thread starter towerette
  • Start date
  • #1
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Suppose i have a spherical volume of 100nm with a solution 30mM.
How many solute molecules it corresponds to?

My answer is about 6400...is that correct?
im just not sure i did some conversion correctly...

Thanks
Alfio
 

Answers and Replies

  • #2
Borek
Mentor
28,808
3,308
100nm is what? Radius? Diameter?

6400 of what?

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  • #3
4
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Sorry for not being clear, 100nm is the radius.
N = 6400 is the number of solute particles I get
from the formula c = N/(N_A*V), just wanted to know
if its right.
c = 30mM

Thanks.
Alfio
 
  • #4
Borek
Mentor
28,808
3,308
Formula is OK, but I got different number. Not necesarilly correctly.

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methods
 
  • #5
4
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I did the calculation again, i got around 75000 molecules, right?
Well..it seems i'm playing dices...

Best,
Alfio
 
  • #6
Borek
Mentor
28,808
3,308
That's what I got as well.

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