The half-cell, Tl | Tl+(1 mol L?1), is connected to a Pt | H+ |H2(1 atm) half-cell in which the
concentration of H+ is unknown and the pressure of H2 is keptconstant at 1 atm. Immediately after
connecting the two half-cells, the cell voltage is measured as0.0814 V and it is observed that the
Pt | H2 | H+ half-cell is the cathode. Standard reductionpotentials are given on the next page.
(a) (2 marks) Draw a diagram of the electrochemical cell, labelingall electrodes and solutions.
(b) (5 marks) What is the initial pH in the Pt | H+ | H2half-cell?
(c) (3 marks) What is the value of the equilibrium constant for thereaction occurring in this cell?
(d) (5 marks) What is the cell voltage and the concentrations of[H+] and [Tl+] at the instant the pH
has changed by exactly one unit?
The half-cell, Tl | Tl+(1 mol L?1), is connected to a Pt | H+ |H2(1 atm) half-cell in which the
concentration of H+ is unknown and the pressure of H2 is keptconstant at 1 atm. Immediately after
connecting the two half-cells, the cell voltage is measured as0.0814 V and it is observed that the
Pt | H2 | H+ half-cell is the cathode. Standard reductionpotentials are given on the next page.
(a) (2 marks) Draw a diagram of the electrochemical cell, labelingall electrodes and solutions.
(b) (5 marks) What is the initial pH in the Pt | H+ | H2half-cell?
(c) (3 marks) What is the value of the equilibrium constant for thereaction occurring in this cell?
(d) (5 marks) What is the cell voltage and the concentrations of[H+] and [Tl+] at the instant the pH
has changed by exactly one unit?
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