Calculate the expected concentration of the NaOH solution that is prepared in Experiment 1. The molar mass of NaOH is 39.997(g)/(m)ol. Concentration of NaOH: M Calculate the expected mass of benzoic acid required to react with 20.00 mL of the NaOH solution. The molar mass of benzoic acid is 122.12gmol. Mass of benzoic acid: