Consider this equilibrium: I2(s) + H2O(l) ⇌ H+(aq) + I-(aq) + HOI(aq). What is the Keq expression for this equilibrium?
1 Answer
The expression is
We often consider a generic reaction of the form
aA +bB ⇌ cC +dD
The equilibrium constant expression for this reaction is
Notice that it is always "products" over "reactants". Each component A, B, C, and D is raised to the power of its coefficient a, b, c, and d in the balanced equation.
The concentration of a solid or of a liquid does not change during a reaction. We omit it from the equilibrium constant expression.
Consider the equation
I₂(s) + H₂O(l) ⇌ H⁺(aq) + I⁻(aq) + HOI(aq)
I₂ is a solid, and H₂O is a liquid. Their concentrations do not change during the reaction. We omit them from the
All the products are in solution. They can change their concentrations. We keep them in the
Thus, the