## Concentrations

Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.

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sophi3nutt
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Joined: Tue Apr 21, 2009 11:30 am

### Concentrations

A solution of BCG (10mg/L) was used.
1.0 ml of BCG was added to 4.0 ml of water.
How do I find out the moles/litre for this?
Molecular weight of BCG is 698.
Thanks

mith
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN
Contact:
find how much solute you have, divide by how much solvent. Change to moles as necessary.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

tranglee
Garter
Posts: 4
Joined: Thu Apr 30, 2009 4:34 am
first: we find the weight of BCG when solution 1.0ml :
= 10mg/L x 1.0 X 10^(-3)L= 0.01 mg= 0.0001g
and we have the mole of BCG
=0.0001/698=0.00000014(mol)
the moles/litre is:
=0.00000014/((1.0+4.0)x10^(-3))=0.00003

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