complete question

The figure shows a series of standard additions of Cu?+ to acidified tap water measured by anodic stripping voltammetry at an iridium electrode. The unknown and all standard additions were made up to the same final volume. 2.0 + 500 ppb +400 ppb 1.6 + 300 ppb +200 ppb 1.2 Current (A) + 100 ppb 0.8 Tap water 0.4 0.1 0.2 0.3 0.4 Potential (V vs. Ag | AgCl) Anodic stripping voltammograms of tap water and five standard additions of 100 ppb Cu2+ [Data from M. A. Nolan and S.P. Kounaves, "Microfabricated Array of Ir Microdisks for Determination of Cu2+ and Hg2+ Using Square Wave Stripping Voltammetry," Anal. Chem. 1999, 71, 3567.) What chemical reaction occurs during the concentration stage of the analysis? reaction: Incorrect What chemical reaction occurs during the stripping stage of analysis? reaction: Incorrect Measure the initial current and the current after each standard addition and find the concentration of Cu2+ in the tap water. [Cu+1 = 173.33 ppb Incorrect