Hydrogen gas at 1 atm pressure is bubbled through Ni2+ ions present in a purified solution
(obtained after solvent extraction). If the activity of Ni2+ in solution is 0.3, determine the minimum
pH required to precipitate Ni from the solution at 25oC. {Data: Standard oxidation potential for
H2/2H+ and Ni/Ni2+ are 0.0 V and 0.25 V respectively, R = 8.314 J/mol/K, Faraday constant = 96500
Coulomb/gm eqv wt}.
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