Question

The company for which you work recently received a shipment of 4-hydroxyamphetamine, C9H13NO, to be used in the production of eye drops for dilating the eye pupils. The shipment can be accepted only if the 4-hydroxyamphetamine is more than 99% pure. To evaluate the shipment's purity, a 0.2341-g sample is dissolved in water and titrated to the 1,3,5-trinitrobenzene end point (pka=13), requiring 22.18 mL of 0.1354M NaOH. Report the shipment's purity as %w/w of C9H13NO. 4-hydroxyamphetamine is diprotic with pka values 9.8 and 10.48.

Answer 1

Moles NavH required for tihration Molarity xvolme in こ 0-135 M x 2 2.18m2LxL /80D mL 3. Oo X/o3 AS a diproh'e asid, moles wil be helf of moles Nao H 3.00 X10 Moles mo -50x0 2. Jeru

Molar mars i51. 21 /ma) HNo Mars H,NO samph isOKIOms) X1S1.219/mel 0 2268 Punity o Sampl : 0 2268 0-234j 96.88