(a) Give the electrolyte of a named secondary electrochemical cell.
(b) Consider the cell represented as shown below: (Cu_{(s)}Cu^{2+}_{(aq)}/Zn^{2+}_{(aq)}/Zn{(s)})
(i) What does the vertical double stroke represent?
(ii) Which of the metals forms the cathode?
(iii) Name the electrode to which each half-cell should be coupled if the oxidation potential of the half-cells are to be determined.
Explanation
(a)(i) Dilute tetraoxosulphate (VI) acid i.e H(_2)SO(_4);
(b)(i) Salt bridge
(ii) Copper metal is the cathode in the Zinc – Zn(^{2+}) voltaic cell.
(iii) Specially prepared platinum electrode over which hydrogen gas is bubbled