3. A 0.7500-g carbonate mixture was dissolved in water and then titrated with 0.2000 N HCl, requiring 24.20 mL for the phenolphthalein endpoint. In another flask, 40.20 mL of the acid was required to reach the bromocresol green endpoint. Calculate the %NaOH, %NaHCO3, and %Na2CO3 in the mixture.