how would you prepare 500 mL of a 1.5 M NaOH solution, starting with a 5.0M NaOH solution?

Answer 1

This is a dilution so use the dilution formula of
mL1 x M1 = mL2 x M2
500 x 1.5 = ? x 5.0
Solve for ?, pipet that number of mL into a 500 mL volumetric flask, add distilled water to the mark of the flask, mix thoroughly, stopper, label.