Efficient Biology Dilution Techniques for Accurate Results | Homework Help

[poli275]

Homework Statement

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 :)

 

[Borek]

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.

 

[nucleargirl]

dude! I went to uni and I still get confused by this! haha
ok, check out this page, it might help:
http://www.mgel.msstate.edu/pdf/solutions.pdf