Answer to Question #162197 in General Chemistry for ash

Question

1. Write a balanced net ionic equation for the overall cell reaction represented by:

Cd|Cd2+‖Sb3+|Sb

Pt|Cu+, Cu2+‖Mg2+|Mg

2.Calculate E◦ for the following voltaic cells:

2 Na (s) + Fe2+ (aq) 🡪 2 Na+ (aq) + Fe (s)

2 S (s) + 4 OH- (aq) 🡪 O2 (g) + 2 S2- (aq) + 2 H2O (basic)

3.Calculate E◦ for the following cells:

Al|Al3+‖Cu2+|Cu

Ag| Ag+‖Sn4+, Sn2+|Pt

4.Which of the following reaction is (are) spontaneous at standard conditions?

Ba (s) + 2 Cr3+ (aq) 🡪 2 Cr2+ (aq) + Ba2+ (aq)

Co2+ (aq) + Cu (s) 🡪 Co (s) + Cu2+ (aq)

Answer 1

1. Cd = Cd2+ + 2e.

Sb3+ + 3e = Sb.

2. Na> Na+ = -2.714.

Fe2+ > Fe = 0.77

E^o0.77 - (-2.714) = 3.484.

3. E0 Al3+ |Al = —1.66.

4. Ba (s) + 2 Cr3+ (aq) 🡪 2 Cr2+ (aq) + Ba2+ (aq)