Answer :
312.5 mL of magnesium chloride stock solution is needed to prepare 1.5 L of 25 mg/mL solution.
This type of chemical process is called dilution. It is the addition of water into a small amount of a concentrated solution or a stock solution to make it less concentrated. In this problem, the equation below is used.
(Concentration of stock solution)(Volume of stock solution needed)=(Resulting concentration of solution)(Resulting volume of solution)
For easier writing of the equation, subscript 1 can be assigned to the concentrated solution and subscript 2 for the diluted solution.
C1*V1=C2*V2
Substituting the given to the formula:
(120 mg/ml)*(V1)=(25 mg/ml)*(1.5 L)
V1= 0.3125 L
V1= 312.5 ml
For more information regarding the dilution process, please refer to the link https://brainly.com/question/6692004.
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