Answer:
Take 46.9 ml of the 12 M solution using a graduated cylinder and pour the liquid in a 250-ml volumetric flask. Add water until the mark.
Step-by-step explanation:
To prepare this solution, you have to take a volume of the 12 M HCl solution and add water to 250 ml. What volume should you take?
The number of moles of HCl present in the volume you take from the concentrated solution will be the same as the number of moles in the final solution since you are only adding water. Then:
number of moles of HCl in the taken volume = number of moles in the final solution.
number of moles of HCl = concentration (in molarity) * volume
Then:
Ci * Vi = Cf * Vf
Where
Ci = the concentration of the solution from which you take the volume to prepare the more diluted solution.
Vi = the volume of the concentrated solution you have to take.
Cf = Concentration of the final solution
Vf = volume of the final solution
Replacing with the data:
12.0 M * Vi = 250.00 ml * 2.25M
Vi = 46.9 ml