Answer: The volume taken from the reagent bottle must be 72.91 mL
Explanation:
To calculate the volume of concentrated solution, we use the equation:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1\text{ and }V_1[/tex] are the molarity and volume of the concentrated solution which is the reagent bottle.
[tex]M_2\text{ and }V_2[/tex] are the molarity and volume of diluted solution which is the solution to be prepared.
We are given:
[tex]M_1=12M\\V_1=?mL\\M_2=3.5M\\V_2=250mL[/tex]
Putting values in above equation, we get:
[tex]12\times V_1=3.5\times 250\\\\V_1=72.91mL[/tex]
Hence, the volume taken from the reagent bottle must be 72.91 mL
