Question

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 much ampicillin stock and how much deionized water are needed to make this

Answer 1

Answer:

The amount of  ampicillin stock is  $V_3 = 7.5 mL$

The amount of deionized  is 22.5 \ mL

Explanation:

From the question we are told that

   The volume of stock solution of ampicillin in de-ionized water is $V_0 = 100 mL$

   The concentration (in mg ) of ampicillin in de-ionized is $C_0 = 100 mg/mL$

    The volume of ampicillin in deionized water to produce is $V_2 = 30ml$

The concentration (in mg )  of ampicillin in de-ionized water to produce is $C_2 = 25 mg/mL$

The chemical process can be mathematically represented as

            $V_3 100 = 30 * 25$

=>          $V_3 = \frac{30*25}{100}$

             $V_3 = 7.5 mL$

The amount of  ampicillin stock is  $V_3 = 7.5 mL$ and amount of 25 mL  (30 - 7.5 = 22.5 mL ) of deionized water