CHEM 123-Quiz #9 Question 1. The standard electrode potential for the reduction
ID: 304386 • Letter: C
Question
CHEM 123-Quiz #9 Question 1. The standard electrode potential for the reduction of Eu (ap) to Eu (aq) is-043 V Use the data shown below to determine which of the following species is capable of reducing Eu (aq) under standard conditions. Select all that apply. Data: Standard Electrode (reduction) potentials at 25OC Reduction half-reaction C2N2(g) + 2H+(aq) + 2e 2 HCN(aq) +0.37 V in'+(aq) + 3 e- ln(s) 2 CO2(g) + 2H+(aq) + 2e-Ft H2C2Odaq) -0.49 V Na (aq) + e Na(s) sr"(aq) + 2 e--Sr(s) -0338 V 2 -2.714 V 2.899 V o In(s) o HCN(aq) o sr (aq) O Na(s) o H,C204(aq)Explanation / Answer
the species that has more negative redox potential than -0.43 V will reduce the Eu3+ to Eu2+
so the H2C2O4 and Na are capable of reducing the Eu3+ to Eu2+