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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: Jason27$$ on May 18, 2020, 04:33:36 PM

Title: Need help with a calculation please
Post by: Jason27$$ on May 18, 2020, 04:33:36 PM

I have a stock solution of 1 mg/mL of a specific drug

I need to take a dosage of 5 MICROgrams.  So 1 drop of the stock solution would be 0.05 mL or 0.05 mg(50 ug)

If i take 1 drop of the stock solution and dilute it in 9 drops of water it will be a 1:10 dilution

So would the 10 drops contain 5 MICROgrams and would i just take this to get that dose or do i need to take 0.05 mL(1 drop) from this dilution? 

Sorry if this is a dumb question i just havent done this in a while- i appreciate the help

Title: Re: Need help with a calculation please
Post by: chenbeier on May 18, 2020, 04:51:49 PM

You give 50 μg = 1 drop  together with 9 drops of  water. 10 drop of this mixture still contain 50 μg. If you take now 1 drop of it, you would have 5 μg.

Title: Re: Need help with a calculation please
Post by: Jason27$$ on May 18, 2020, 04:56:02 PM

oh great thank you much appreciated