Question 1
Calculate the
Ksp of lead iodide from the following standard electrode potentials, at 25 °C:
2 e
- + PbI
2(S)
→ Pb(s) + 2 I
-(aq)
E° = -0.365 V
2 e
- + Pb
2+(aq)
→ Pb(s)
E° = -0.126 V
◦ 8 × 10
-9 ◦ 9 × 10
-5 ◦ 2 × 10
-17 ◦ 5 × 10
-13 ◦ 6 × 10
-5 Question 2
Calculate the mass of I
2(s) produced at the anode if a current of 2.85 A is passed through a solution of KI(aq) for 56 minutes.
◦ 0.42 g
◦ 0.13 g
◦ 13 g
◦ 25 g
◦ 4.3 g