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The reaction quotient is the proportion of the molarity of the products to the reactants at any given time of the reaction. It's pretty much the same as Kc and Kp but those two are measured specifically at equilibrium.
The Reaction quotient Q is a number representative of what stage a reaction is at relative to its equilibrium conditions. Q can be used as a checkpoint in such a manner and will allow us to make predictions about which direction the reaction will tend to proceed. In order to do this, K will usually be known in regards to a certain reaction, and we can compare the Q that we calculate to see which direction the reaction will proceed.
We only use the reaction quotient in this class to be able to compare it to the equilibrium constant and see if more reactants or products will form as the vessel sits. It's derived in the same way as K (as the person above said)
Reaction quotient is used to determine whether the equation is at equilibrium (so compare to the K value). If not, we can predict which direction the reaction needs to favor in order to reach the equilibrium rate for both sides.
I think it is easy to mix up Q and K because they're calculated the same way! However, Q is used to calculate the ratio between products and reactants at any given time, while K is used to calculate the ratio between products and reactants exactly at equilibrium. Q will always proceed towards K in order to reach equilibrium.
The reaction quotient is the ratio of products to reactants at any time during the experiment but K is the ratio of products to reactants at equilibrium only. The reaction quotient will often tell you if the reaction is at equilibrium or which side (left or right) it favors.
if the reaction is not at equilibrium, or if you aren't sure, then you are calculating the reaction quotient. It is the same equation as K. it can be used, when compared to K, to determine which way the reaction is proceeding
Reaction quotient is just you looking at the same system, at a certain point in time, and comparing it to what it should be at equilibrium. If they match up, great! your system's chilling at equilibrium. If not, you can see the direction in which its progressing to equilibrium.
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