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Homework Help: Biology dilution help.

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data

    Here goes the question: I was told to dilute blood with saline solution, in the ratio of 1 part of blood to 10 parts of saline. I need around 20 cm3 of the blood solution.

    2. The attempt at a solution

    I did it by placing 1 cm3 of blood into a testube, then follow by 9 cm3 of saline solution. Is my way correct? Or I'm suppose to mix 1 cm3 of blood with 10 cm3 of saline?

    Thanks for helping :)
  2. jcsd
  3. Sep 14, 2010 #2


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    Staff: Mentor

    I would take 1 mL of blood and 10 mL of saline, that's what you were told to do.

    1:9 would work if you were asked to dilute ten times.

    Not that that matters much (unless you are doing some precise analytical work). Difference between final concentrations is in the 1% range.
    Last edited by a moderator: Aug 13, 2013
  4. Sep 16, 2010 #3
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