Answer to Question #162198 in General Chemistry for ash

Question

1. Calculate E◦, ΔG◦, and K at 25℃ for the reaction:

2 MnO4-1 (aq) + 4 H+ (aq) + Cl2 (g) 🡪 2 Mn2+ (aq) + 2 ClO3- (aq) + 2 H2O

1. What is E◦ at 25℃ for the following reaction?

Ba2+ (aq) + SO42- (aq) 🡪 BaSO4 Ksp for BaSO4 is 1.1 x 10-10

Answer 1

Let's write Half reaction for the net ionic reaction

• MnO₄^- + 8H⁺ + 5e^- $\rightarrow$ Mn²⁺ + 4H₂O E₁
• Cl₂ +6H₂O $\rightarrow$ 2ClO₃^- + 12H⁺ + 10e^- E₂

∆G = -nFE₁ - nFE₂

∆G = -RT lnK from this equation we calculate value of K.

2. using nernst equation

E = - (0.059/n) x log K

E = - (0.059/2) x log (1.1x 10^-10)

E = 0.293