*14.121. Elements of group 16 form hydrides with the generic\ formula

H_(2)x

. When gaseous

H_(2)x

is bubbled through a\ solution containing

0.3M

hydrochloric acid, the solution\ becomes saturated and

[H_(2)x]=0.1M

. The following\ equilibria exist in this solution:\

H_(2)x(aq)+H_(2)O(l)Hx^(-)(aq)+H_(3)O^(+)(aq)K_(1)=8.3\\\\times 10^(-8)\ Hx^(-)(aq)+H_(2)O(l)x^(2-)(aq)+H_(3)O^(+)(aq)K_(2)=1\\\\times 10^(-14)

\ Calculate the concentration of

x^(2-)

in the solution.

14.121. Elements of group 16 form hydrides with the generic formula H2X. When gaseous H2X is bubbled through a solution containing 0.3M hydrochloric acid, the solution becomes saturated and [H2X]=0.1M. The following equilibria exist in this solution: H2X(aq)+H2O()HX(aq)+H3O+(aq)HX(aq)+H2O()X2(aq)+H3O+(aq)K1=8.3108K2=11014 Calculate the concentration of X2 in the solution