Final answer:
The volume of 12M HCl needed to make 1.5L of 1.2M HCl is 10L.
Step-by-step explanation:
To find the volume of 12M HCl needed to make 1.5L of 1.2M HCl, we can use the formula:
volume of 12M HCl = (concentration of initial solution * volume of initial solution) / concentration of final solution
Plugging in the values, we get:
volume of 12M HCl = (12M * X) / 1.2M
Simplifying, we find that the volume of 12M HCl needed is 10L.