A certain half-reaction has a standard reduction potential Ered= +0.19V. An engineer proposes using this half-reaction at the anode of a galvanic cell that must provide at least 0.80V of electrical power. The cell will operate under standard condition. Required:
Is there a minimum standard reduction potential that the half-reaction used at the anode of this cell can have?

the dependant variable is spilled water

the independent is the heat

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-