General Chemistry 2 concentration dilution problem

Question

3. A 4.50 *10^-2 M solution is used to prepare a series of five 100.0 mL solutions of varying concentration for use in creating a calibration curve for a spectrophotometric experiment. Determine the concentrations of each of the five dilutions if 15.0 mL aliquots of the current solution is used for V1.

I need help on how to solve this.

Answer 1

You can use V1M1 = V2M2 where V1 is 15.0 ml

(15.0 ml)(4.50x10^-2 M) = (100.0 ml)(x M)

x = 6.75x10^-3 M

You can’t use 15 ml for all dilutions otherwise all five solutions will have tge same concentrations. Not sure what the rest of the question is.