# High School Chemistry : Help with Reaction Quotient

## Example Questions

### Example Question #1 : Help With Reaction Quotient

Consider the following balanced reaction:

The solution has the following concentrations:

Based on these concentrations, what will happen to the solution?

It will shift to the right

It will shift to the left

The system is at equilibrium

It will shift to the left

Explanation:

By placing these initial concentrations in the equilibrium expression, we can compare the reaction quotient, , to the equilibrium constant,

The reaction quotient for this reaction is:

Note that the reactant is a pure solid, and will not be included in this expression. By setting this equal to the equilibrium constant, we can see whether  or is larger in value.

We can predict how a solution will change based on the value of . When  is less than , the reaction will shift to the right. If  is greater than , the reaction will shift to the left. If  is equal to , the solution is at equilibrium.

Since the value for  is greater than the equilibrium constant in this instance, the reaction will shift to the left.

### Example Question #56 : Reactions And Equilibrium

Consider the following reaction.

What is the reaction quotient if ?