Answer to Question #224803 in General Chemistry for sam

Question

6. Answer the following electrochemistry questions:

a) A Cu(s)/Cu2+(aq) half-cell and a CI-(aq)/CI2(g) half-cell are coupled together to make a voltaic cell.

i. Determine the net spontaneous cell reaction which would occur and calculate E°cell.

ii. Draw a sketch of the voltaic cell formed in part i). In your sketch, show which chemical species are present (and where), label the electrodes and any other important parts. Be sure to show also the direction of electron and ion flow.

b) For the following electrochemical cell operating at 25.0 °C:

3Zn(s) + 2Cr3+(aq, 0.0095 M) → 3Zn2+(aq, 0.0078 M) + 2Cr(s)

calculate E°cell, Ecell, ΔG°, ΔG and Keq.

Answer 1

$Cu^{2+}_{(aq)}\rightarrow$

Cu_{(s)}

Cu²⁺_(aq) + 2e- → Cu_(s) with SRP E^o = +0.340 V (Cathode; where reduction happens)