The cell potential for the unbalanced chemical reaction :
Hg 2 2+ + NO 3 – + H 3 O + ⎯→ Hg 2+ +HNO 2 + H 2 O
is measured under standard state conditions in the electrochemical cell shown in the accompanying diagram. the cell voltage is positive : EºCell = 0.02 V
Given
NO 3 – + 3H 3 O + 2e – ⎯→ HNO 2 + 4H 2 O
Eº = 0.94 V
(i) Which of the following statements must be true of the solutions in order for the cell to operate with the voltage indicated?
0.6 mole
0.8 mole
0.3 mole
× 
(iii) How many moles of electrons pass through the circuit when 0.6 mole of Hg2+ and 0.30 mole of HNO2 are produced in the cell that contains 0.5 mole of Hg 2 2+ and 0.40 mole of NO3– at the begining of the reaction ? 1 mole
Text Solution
Verified by Experts0.6
(i)
Sol. The solutions in both Dish A and Dish B must be iiacidic
(ii)
Sol. 
× 
(iii)
Sol. 0.6 mole
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