. A sample weighing 3.458 g is dissolved and diluted to 250.0 mL in a volumetric flask. A 50.0 mL aliquot is withdrawn with a pipette and titrated with 34.15 mL of 0.0566 M solution of I2. Calculate the following: a. The percentage of arsenic in the sample. b. The percentage is expressed as As2O3.