You have a stock solution that is 226mg/mL and you need 10mL of a working solution that is 15mg/mL. What is the volume of stock solution will you need to dilute to have 10mL of working solution at the above concentration. State your answer to two decimals.

0.67 ml

Explanation:

According to the dilution law,

where,

= concentration of stock solution = 226 mg/ml

= volume of stock solution = ?

= concentration of working solution= 15 mg/ml

= volume of working solution= 10 ml

Putting in the values we get:

Thus volume of stock solution needed to dilute to have 10mL of working solution at the above concentration is 0.67 ml