Question #c5ab5
1 Answer
It is not a dilution, but a concentration increase by a factor of 10
Explanation:
If we go for the definition of dilution factor, you would find that it refers to the final volume/aliquot volume (final volume = aliquot + diluent) [DILUTIONS: Principles and Applications, David B. Fankhauser, http://biology.clc.uc.edu/fankhauser/labs/microbiology/dilutions.htm],
In this case the question would be what is the final concentration of my solution? And if it is smaller than the initial one, yes you have a dilution, but as it seems to be in reality you are increasing the concentration of your solution.
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Lets see then the starting conc. is 5g
#//# 20ml = 0.25g#//# ml#=# 250mg#//# mL#=# 0.25mg#//# #mu# L -
when you take 3ml and then evaporating the solvent, you are ending with:
250mg/mL#xx# 3mL#=# 750mg of the solute. -
dissolving them in 300
#mu# l yield the following solution
750mg#//# 300#mu# L#=# 2.5mg#//# #mu# L -
Now your starting concentration was 0.25mg
#//# #mu# L and your actual one is 2.5mg#//# #mu# L then your concentration was increased by a factor of 10.
-Need to be careful with units, if you want to present them back in g
2.5mg