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Homework Help: Preparation of standard stock solution

  1. Dec 1, 2016 #1
    1. The problem statement, all variables and given/known data
    In this experiment we will create a standard stock solution from lyphochek serum. The concentration of proteins in serum Lyphochek is 6,8 g / dl. Pipette 1.36 mL Lyphochek serum in a 25 mL volumetric flask and dilute with physiological water. Calculate the standard stock solution concentration that you will make.

    2. Relevant equations

    3. The attempt at a solution
    6,8 g/dl = 0,068 g/mL
    0,068 g/mL x 1,36 mL = 0,09248 g / 25 mL = 0,0036992 g/mL
    369,92 mg/ dl is the answer

    is this answer correct ??
  2. jcsd
  3. Dec 1, 2016 #2


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    Staff: Mentor

    Logic is OK, but where did you got so many significant figures from?
  4. Dec 1, 2016 #3
    Significant figures doesn't really matter here I think
  5. Dec 1, 2016 #4
    thank you for your answer
  6. Dec 1, 2016 #5


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    Homework Helper
    Gold Member

    370 is all you'll ever need.
    Are you forced to use horrible, unnecessary dL units?
  7. Dec 8, 2016 #6
    Not really . I just wanted to know if my calculation was correct or not
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