Using a 10 mg of extract, calculate the stock solution of 1 mg/ml which later needs to be diluted into various concentration 100, 50, 10, 5, 1 and 0?

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Alexandra Johnson

You would need 10 mL of solvent for 10 mg of extract to make 1 mg/mL. The dilutions can't be calculated without knowing the units for the concentrations.

Nr Izzatie Yes, that is the equation you would use. Just remember to keep the units the same on both sides - ie. 1 mg/mL = 1000 µg/mL if you're calculating for a µg/mL concentration.