Describe how you would make 500.0mL of a 0.200M NaOH solution from a 15.0 stock NaOH conentration

Answer 1

500.0 mL x 0.200M = xmL x 15.0M(although you didn't write M).
Solve for x and I get 6.667 mL. In practice you add 6.667 ml of the 15.0M NaOH to a 500.0 mL volumetric flask and add water to the mark on the flask. Note that you DO NOT add 6.667 mL NaOH to 493.3 mL H2O.