Question

Write the concentration equilibrium constant expression for this reaction. 3I2(s)+2Cr+3(aq)+7H2O(l)→Cr2O−27(aq)+6I−(aq)+14H+(aq)

Answer 1

The equilibrium constant for any reaction A + B -> C + D is given by:
\[k _{eq}=\frac{ [C][D] }{ [A][B] }\]

Answer 2

Also remember that in the expression for an equilibrium constant the concentration of a solid is not included since their concentrations vary negligibly compared to liquids and gases.