2.5 grams of a metallic sample containing an unknown amount ofzinc is dissolved in 500 ml of acidic water, releasing the zincinto the water as Zn2+ ions. A 10.00 ml aliquot of thissolution is extracted with 10 ml of CCl4 containing anexcess of 8-hydroxy quinoline. The CCl4 and aqueousphases separate and 8-hydroxy quinoline forms a fluorescent complexwith Zn2+ ions that partitions entirely into theCCl4 phase. The CCl4 phase is separated andthen diluted to 25 ml. This solution gives a fluorescence intensityof 155 (arbitrary units). A similar procedure is done with 10.00 mlof the unknown zinc solution plus 8.00 ml of an aqueous 2.50 ppmZn2+ solution, and the final fluorescence intensity is247. Calculate the Zn2+ concentration in the original500 ml solution and the amount of zinc in the original solid.
