For a fairly simple chemical manipulation, your question is quite unclear, is the 1ml in 10ml dilution an example. Also, are you diluting 0.020 ml (20 µl) with 99.98 ml or 0.002 ml (2 µl) with 99.998 ml?

If I understand your question correctly, diluting 0.020 mL (20 µl) of the 1mg/ml stock into 100 ml (final volume) is worked as follows:

1 mg/ml × 0.02 ml ÷ 100 ml = 0.0002 mg/ml.

This is a 100 ÷ 0.02 = 5000-fold dilution.

Hi,

You may use the web tool to calculate

https://www.alfa-chemistry.com/solution-dilution-calculator.htm