问题详情

Amines(weak base)form salts with picric acid(trinitrophen01)，and all amine picrates exhibit an absorption maximum at 359nm with a molar absorptivity of 1.25×10⁴L·mol^-1·cm^-1. A 0.200g sample of aniline，C6H 5NH2，is dissolved in 500mL water. A 25.0mLaliquot is reacted with picric acid in a 250.0mL volumetric flask and diluted to volume. A 10.0mL aliquot of this is diluted to 100mL and the absorbance read at 359nm in a 1.0cm cell. If the absorbance is 0.425，what is the percent purity of the aniline？