Explanation:
Volume of the stock solution is = ?
Initial concentration of ampicillin is = 100 mg/ml
Final volume () = 30 ml
Final concentration of ampicillin () = 25 mg/ml
Therefore, calculate the volume of given stock as follows.
=
Now, putting the given values into the above formula as follows.
=
=
= 7.5 ml
Now, we will calculate the volume of water added into it as follows.
Volume of water added =
= 30 ml - 7.5 ml
= 22.5 ml
Thus, we can conclude that required solution is 22.5 ml of deionized water.