Question

A 1979 penny was digested in 20.0 mL of 1:1 HNO₃/H₂O and diluted to 100.0 mL. 1.00 mL aliquot was diluted to 10.0 mL and measured by UV spectroscopy gave an absorvance of 0.563. A copper standard was prepared by digesting 0.235 g of pure copper shot in 20 mL of 1:1 HNO₃/H₂O solution and diluted to 100.0 mL. 1.00 mL of copper standard an 1.00 mL of sample aliquot were mixed and diluted to 10.0 mL, the absorvance of this sample was 0.669. find the concentration of copper in the 1979 penny.

Answer 1

Contente 1 -2-3Sx IDS|rnl (Cr) 0-2.ZSg 二 Crndentra kvn, Concentrak n 다 std BeGt.on-_ 2.35x1Db/rnd In theat mindenlonel -y A C ConCer A2, 0-669 109