How much concentrated 12 M hydrochloric acid (HCl) is needed to prepare 1.0 × 102 mL of a 2.0 M solution?

Answer 1

Again, I would use the equation M1 x V1 = M2 x V2

M1 = 12M

M2 = 2.0M

V1 = 1.0 x 102 ml

V2 = ????

You can manipulate the formula again to solve for V2

M1 x V1/ M2 = V2

Plug in your numbers and solve and don't forget the sig figs!