Solving a problem in chemistry section 10 point 32

32. A portion of the sodium salt yellow weighing 14.58 g was dissolved in water and then acidified with sulfuric acid and an excess of sodium sulfite was added, and the color of solution changed to greenish. With gradual addition of alkali to the resulting solution dropped first green gelatinous precipitate, which was then completely dissolved in an excess of alkali. Determine the volume of 20% sodium hydroxide solution (density 1.2 g / ml) which was required for complete dissolution of the precipitate.