Barrons SAT Subject Test Chemistry, 13th Edition

63. (C) In dilution problems, the expressions M 1 × V 1 = M 2 × V 2 can be used.

Substituting (6.0 M) (0.50 L) = (2.0 M) (x L) gives x = 1.5 L total volume.

Since there was 0.50 L to begin with, an additional 1L must be added.