Biology Forum › Molecular Biology › Concentrations

last updated by tranglee 14 years, 12 months ago
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    • April 21, 2009 at 11:47 am #11247
      sophi3nutt
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      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

    • April 21, 2009 at 2:02 pm #90252
      mith
      Participant

      find how much solute you have, divide by how much solvent. Change to moles as necessary.

    • April 30, 2009 at 4:57 am #90483
      tranglee
      Participant

      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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