What volume of a solution with a mass fraction of sodium hydroxide of 20% and a density of 1.22 g / ml is required

What volume of a solution with a mass fraction of sodium hydroxide of 20% and a density of 1.22 g / ml is required to neutralize a monobasic carboxylic acid weighing 14.8 g?

Decision:
1) Find the masses 14.8 g -100% m (C) -48.65% m (C) = 7.2 g m (O) = 6.4 g m (H) = 1.2 g n (C ): n (O): n (H) = 7.2 / 12: 6.4 / 16: 1.2 / 1 = 0.6: 0.4: 1.2 = 1.5: 1: 3 = 3: 2: 6
2) CH3-CH2-COOH – alcohol formula
3) CH3-CH2-COOH + NaOH => CH3-CH2-COONa + HOH -74 g-40 g -14.8 g-x x = m (NaOH) = 8 g
4) Find the mass of a 20% solution: m p-pa (NaOH) = m (NaOH) / w (NaOH) = 8 / 0.2 = 40 g
5) Find the volume of the solution: Vp-pa (NaOH) = mp-pa (NaOH) / po = 40 / 1.22 = 32.8 ml
Answer: 32.8 ml