You have a 100 ml stock solution of 100 mg/ml ampicillin in deionized water. you want to make 30 ml of 25 mg/ml ampicillin in deionized water. how many milliliters (ml) of 17 ampicillin stock and how many of deion ized water are needed to make this stock solution? atealk

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.

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