2. (a) A student is required to construct a battery in the form of a galvanic cell using nickel (II) nitrate and cadmium

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2. (a) A student is required to construct a battery in the form
of a galvanic cell using nickel (II) nitrate and cadmium (II)
nitrate. Given that a 0.75 M solution of nickel (II) nitrate must
be used, what concentration of cadmium nitrate is required to
achieve a cell voltage of 0.12 V at 25 ℃?
Ni2+(aq) + 2e- ==> Ni(s)
E o
red = - 0.40 V
Cd2+(aq) + 2e- ==> Cd(s)
E o
red = - 0.26 V