The equilibrium constant for the reaction C 6H 5COOH(aq) + CH 3COO –(aq) C 6H 5COO –(aq) + CH 3COOH(aq) is 3.6 at 25°C. If K a for CH 3COOH is 1.8 × 10 –5, what is the acid dissociation constant for C 6H 5COOH?

  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-