How many mL of 2. 55 NaOH is needed to make 125 mL 0. 75 NaOH solution?

To determine the volume of 2.55 M NaOH needed to make a 125 mL 0.75 M NaOH solution, you can use the formula for dilution: M1V1 = M2V2. In this case, the initial concentration (M1) is 2.55 M, the final concentration (M2) is 0.75 M, and the final volume (V2) is 125 mL. Solving for V1 (the initial volume of 2.55 M NaOH needed) gives you approximately 415.69 mL.