Question

when you use the rate statement for a reaction what are the variables and what are you finding?

Answer 1

Given a reaction, when we write its rate statement, we are writing its Reaction Quotient, Q(if the reaction is not in equilibrium) or its Equilibrium Constant, K_eq(if the reaction is in equilibrium).

What we are trying to find out is in which direction the reaction will proceed, i.e., whether the formation of Products or Reactants is more favorable.

The variables used while writing the rate eqn are the Activities of compounds involved. Activity of a substance can be its concentration in aqueous form, gas pressure, etc.