1) An electrolysis cell is set up with inert platinum, Pt, electrodes. Which one of the following will produce a gas at the cathode when undergoing electrolysis in the cell?
A. potassium iodide, KI(aq)
B. sodium chloride, NaCl(l)
C. lead bromide, PbBr₂(l)
D. copper sulfate, CuSO₄(aq)

Solution

2) Hydrogen, H₂ , can be produced using electricity generated by renewable sources. A simplified diagram of an acidic electrolyser used to produce hydrogen is shown below

a. Draw an arrow in the box provided on the diagram to show the direction of flow of electrons through the wire. Justify your answer.

Solution

b. State two functions of the membrane.

Solution

c. Write the overall equation for the reaction that takes place in the acidic electrolyser shown above when it is operating at 80 °C.

d. How many moles of H₂ could be produced by the acidic electrolyser using 1625.0 A in 1.25 hours, assuming 100% efficiency?

Solution