Question

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.

Answer 1

Answer: 0.67 ml

Explanation:

According to the dilution law,

$C_1V_1=C_2V_2$

where,

$C_1$ = concentration of stock solution = 226 mg/ml

$V_1$ = volume of stock solution = ?

$C_2$ = concentration of working solution= 15 mg/ml

$V_2$ = volume of working solution= 10 ml

Putting in the values we get:

$226mg/ml\times V_1ml=15mg/ml\times 10ml$

$V_1=0.67ml$

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