## Equilibrium Constant and Reaction Quotient

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Victoria Luu - 1C
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

### Equilibrium Constant and Reaction Quotient

What exactly is the difference between the reaction quotient and the equilibrium constant? Are they calculated the same way?

Noah Fox 1E
Posts: 31
Joined: Fri Sep 28, 2018 12:20 am

### Re: Equilibrium Constant and Reaction Quotient

The reaction quotient is the ratio of products and reactants with their stoichiometric counterparts of an equilibrium reaction at ANY point. Equilibrium constants however is this ratio at equilibrium. Q and K are both calculated the same exact way but at (possibly) different points of the equilibrium reaction

inlovewithchemistry
Posts: 104
Joined: Fri Sep 28, 2018 12:19 am

### Re: Equilibrium Constant and Reaction Quotient

The equilibrium constant is K and Q is the reaction quotient. While they are calculated the same way ([products]/[reactants]), they are different. Q is the quantity of products and reactants that actually changes as the system approaches equilibrium. K is the numerical value of Q at the end of the reaction when equilibrium is reached. In comparing Q and K, we can see whether the forward or reverse reaction is favored. If Q>K, then the concentration of reactants is greater than the concentration of products and the forward reaction is favored. The opposite occurs when K>Q.

Karishma_1G
Posts: 67
Joined: Fri Sep 28, 2018 12:18 am

### Re: Equilibrium Constant and Reaction Quotient

The reaction quotient and equilibrium constant are calculated in the same way. The reaction quotient (Q) represents a value at a random point during a reaction where as the equilibrium constant (K) represents a value at exactly equilibrium (when the rate of the forward reaction is equal to rate of the reverse reaction). By comparing K and Q, we can see what stage a reaction is at. In other words, by comparing K and Q we can see whether the forward or reverse reaction is preferred.