The ph of 0.10 m solution of an acid is 6. what is the acid dissociation constant of the acid? 10-11 10-12 10-5 10-6

Dissociation constant of the acid is .

Explanation: Assuming the acid to be monoprotic, the reaction follows:

pH of the solution = 6

and we know that

As HA ionizes into its ions in 1 : 1 ratio, hence

As the reaction proceeds, the concentration of acid decreases as it ionizes into its ions, hence the decreases concentration of acid at equilibrium will be:

Dissociation Constant of acid, is given as:

Putting values of in the above equation, we get

Rounding it of to one significant figure, we get

  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-