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Old 08-04-2011, 05:08 AM
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Default mg/ml to ug/ml dilution

I have a stock solution of 1mg/mL that i want to dilute to 2ug/ml in 10mL solvent
How do i do this?
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Old 08-04-2011, 05:47 AM
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Default Re: mg/ml to ug/ml dilution

Quote:
Originally Posted by Unregistered View Post
I have a stock solution of 1mg/mL that i want to dilute to 2ug/ml in 10mL solvent
How do i do this?
The math is easier if you use a tad less solvent and make up 10 mL total
1000 g/mL * x mL = 2 g/mL * 10 mL
x = 0.02 mL.
Dilute to 10 mL in volumetric flask

If you are determined to add it to a pre-measured 10 mL, assuming volumes are additive
1000 g/mL * x mL = 2 g/mL * (10 mL + x mL)
x = 20/998 mL = 0.02004 mL

The distinction is more important when the dilution ratios are smaller. It is largely a pedantic difference in this case.
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