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`K_c` and `K_p` for heterogeneous equilibrium: Write the equilibrium constant expressions `K_c` and `K_p`, if applicable, for each of the following heterogeneous system: (i) `S(s)+H_2SO_3(aq.)hArr H_2SO_3(aq.)` (ii) `2NH_3(g)+H_2SO_4(l)hArr (NH_4)_2SO_4(s)` (iii) `P_4(s)+6Cl_2(g) hArr 4PCl_3(l)` (iv) `AgCl(s)hArr Ag^(+)(aq.)+Cl(aq.)` (v) `(NH_4)Se(s) hArr 2NH_3(g)+H_2Se(g)` |
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Answer» Strategy: Apply the definitions of `K_c` and `K_p` to each reaction. Remember that in heterogeneous equilibrium, pure solids or pure liquids must be present (however, small it may be) for the equilibrium to exist, but their active masses do not appear in the expression of the equilibrium constant because they are in incoroprated into the value of equilibrium constant. Solution: (i) `K_c=(C_(H_2S_2O_3))/(C_(H_2SO_3))`, `K_p` cannot be defined as no gases are involved (ii) `K_c=(1)/(C_(NH_3))`, `K_p=(1)/(P_(NH_3))` (iii) `K_c=(1)/(C_(Cl_2)^6)`, `K_p=(1)/(P_(Cl_2)^6)` (iv) `K_c=C_(Ag^(+))C_(C1^(-))`, `K_p` undefined, no gases involved (v) `K_c=C_(NH_3)^2C_(H_2Se)`, `K_p=P_(NH_3)^1P_(H_2)Se` |
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