. Assume you have 200 mL of a riboflavin stock solution at a concentration of 50 mg/L and you want to dilute this to a final concentration of 30 ng/L.
(a) If you wanted a final total volume of 100 mL, how much of your original stock solution are you going to have to use? Show your work.
We have 200 mL of riboflovin with concentration of 50 mg/L
So i have 50 mg/L * 200 mL = 10 mg of riboflavin in 200 mL
I need the final concentration of the 30 mg/L with volume of 100 mL
so the amount of riboflaving to be present = 30 mg/L * 100 mL = 3 mg riboflavin
so i need 3 mg of riboflavin
10 mg of riboflavin is present in 200 mL
3 mg will be present in (3 mg * 200 mL)/10 mg = 60 mL
so i need 60 mL of the initial stock of riboflaving to prepare 100 mL of riboflavin with a concentration of 30 mg/L
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