Answer
0.250 L of concentrated hydrocloric acid (12.0M)
Work Step by Step
1. Find the necessary volume:
$C_1 * V_1 = C_2 * V_2$
$ 1.50M * 2.00L= 12.0M * V_2$
$ 3.00M*L = 12.0M * V_2$
$V_2 = \frac{3.00M*L}{12.0M}$
$V_2 = 0.250 L$