Question

How does adding water to antimony trichloride affect (shift) the equilibrium even though it doesn't show up on the equalibrium constant expression? Is it because it dilutes the concentrations of the Cl- ions? Which way does it shift?

SbCl3 (aq) + H20(l) <---> SbOCl(s) + 2H+(aq) + Cl-(aq)

Answer 1

SbCl3(aq) + H2O (l) -----------------------> SbOCl (s) + 2 H+ (aq) + Cl-(aq)

here the equilbrium will not effected by the pure solids and liquids concentrations

and here the more H2O i.e pure liquid is added it does not affect the equilibrium position i.e equilibrium does not shift either right or left and does not change their concentrations

answer => pure liquids and pure solids are taken as unity while writing the Kc expression

pure liquid is added it does not affect the equilibrium position i.e equilibrium does not shift either right or left and does not change their concentrations