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K is the equilibrium constants of the reaction, which is only changed with the temperature. However, Q is the reaction rate at any time of the reaction, which will be changed with add/remove of the substance,volume,and concentrations. In the other words, we say Q includes K; K is one value of Q in the spacial condition.
You can calculate Q and K the same way by following the formula [products]/[reactants] . The only difference is that the reaction quotient, Q is for ANY TIME during the reaction while the values for K are always the concentrations at equilibrium.
No difference in the way you calculate Q and K, but there is a major difference in what they mean. Q means the ratio of Products and reactants at any given point of the reaction, but K is the ratio of Products and Reactants at equalibrium. When comparing Q and K, it can tell us which reaction rate is higher.
There is no difference in the formulas for Q and K. The main difference lies in what Q and K are calculated for. K is the equilibrium constant, therefore it can only be applied to identify when the reaction is at equilibrium. Q, on the other hand, is the reaction quotient and can be calculated at any time during the reaction. The main purpose of Q is to compare it to K and identify which direction the reaction should be proceeding in order to attain equilibrium. When Q is equal to K, then the reaction is at equilibrium.
105085381 wrote:K is found using concentrations at equilibrium, BUT to calculate Q do we just use the initial concentrations or concentrations at any given time?
Yes. Q can be calculated at any time in the reaction, and then you would compare it to the given equilibrium constant, K, to determine if the reaction is at equilibrium, and if not, then which directional reaction is favored. Hope this helps!
The formulas for both Q and K are the same. K specifically tells us when the reaction is at equilibrium. Q can be be found during any instance of the reaction in order to determine which direction the reaction is going when it is compared to K.
The formulae themselves have no difference, but K is only used when the chemical reaction is at equilibrium. Using the equation with Q helps you determine whether the reaction goes forward or in reverse to reach equilibrium.
Yes K and Q have the same formula. More importantly, though, they represent different things that, when compared, yield answers to the direction of the reaction at a certain point in time. K=constant (at equilibrium only), Q=constant (at any point in time throughout the reaction). Each specific value for Q and K are found using the same formula using concentration or pressure based on given variables, as you know. So, when Q<K the reaction favors the products (i.e. will produce more of them), when Q>K the reaction favors the reactants (reverse reaction occurs more often), and when Q=K you've reached or returned to equilibrium. Hope this is helpful. :)
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