Concentrations

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sophi3nutt
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Concentrations

Post by sophi3nutt » Tue Apr 21, 2009 11:47 am

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

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mith
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Post by mith » Tue Apr 21, 2009 2:02 pm

find how much solute you have, divide by how much solvent. Change to moles as necessary.
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tranglee
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Post by tranglee » Thu Apr 30, 2009 4:57 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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