Question

What volume of a 6.0 M HCl solution is required to make 250.0 milliliters of a 1.5 M HCl?
0.38 liters
0.063 liters
0.25 liters
1.0 liters
1.5 liters

Answer 1

m1v1=m2v2
ie (starting Molarity)x(starting Volume) = (final Molarity)x(final Volume)

rearrange algebraically to solve for the necessary variable, in this case they are asking you for the starting volume.

Note, you are given a volume in mL, so you will have to convert it either in the beginning or at the end to Liters to get the correct answer.