He last step is to determine the volume of naoh(aq) solution that contains this many moles of o h − (aq) ions. similar to how you used the concentration and solution volume of c d 2+ (aq) to find the number of moles of c d 2+ (aq) , you will use the concentration of the naoh solution, 1.39 m , to calculate the volume that will deliver 1.05×10−2 mol of o h − . recall that when you multiply the number of moles by molarity to determine volume, you need to invert the values and units of molarity such that the units of moles cancel, thus only the units of liters will remain.