REACTION QUOTIENT

1. Q REACTION QUOTIENT

2. Q is the reaction quotient • Gives the condition of the reaction at any point during the reaction. • [X]o indicates the initial concentration of a species

3. Q is the reaction quotient • is expressed the same as K • [Products]coeff • [Reactants]coeff • At equilibrium K = Q

4. Think of the reaction like sand in an hourglass. K Reactants Reactants K K Reactants It can be tipped to run one way or the other. Q Q Q Products Products Products

5. K Reactants Q Products At EQUILIBRIUM the forward reaction will equal the reverse reaction

6. K Reactants Q Products At EQUILIBRIUM K = Q

7. K Reactants Q Products So if K is larger than Q which way do we need to “tip” the reaction to make them equal?

8. Reactants K K Products Q Q So if K is larger than Q which way do we need to “tip” the reaction to make them equal? Tip towards Q, PRODUCTS. The reaction favors products.

9. Reactants Reactants K Products Products K Q Q What if K is smaller than Q which way do we need to “tip” the reaction to make them equal? Tip towards K. The reaction favors reactants.

10. Reactants K Products Q When Equilibrium is reached K = Q Forward and reverse are equal.