Reaction quotient

[Tianna Nguyen 1I]

Hi, I'm still not sure what the meaning of Q exactly is. How is Q related to K? Thanks!

[Kiku Shirakata 2A]

Hello,

The reaction quotient, Q, is the quotient of the activities of products and reactants at any stage of a reaction. On the other hand, the equilibrium constant, K, is the constant of a certain reaction when it is at equilibrium. We can calculate the Q value at any point in a reaction and compare it to K to see whether the reaction has reached equilibrium or not. We can also compare the values to see which direction the reaction will shift to reach equilibrium.

Hope this helps!

[Mia Hansen 2I]

Q is calculated the same as K. However, Q can be calculated at any time during a reaction and K is only when the reaction is at equilibrium. If Q<K the reaction favors the products and if Q>K the reaction favors the reactants

[Jillian Sarquiz- 2B]

Q is the reactant quotient which is the ratio of products to reactants at any time during a reactant. This is different than K which is the ratio of products to reactants at equilibrium. If Q=K, then the reaction is at equilibrium.

[Sean Sanders 1E]

Q is the reaction quotient that measures the ratio of products to reactants at any point in the reaction. Q is very similar to K in that they measure the same values [concentrations/pressure of products to reactants] but differ in that Q can be measured at any point in the reaction while K is measured only at equilibrium.

[Aaron Kwan 3B]

If you wait long enough, the Q (ratio of activities of products to reactants) will eventually settle to equilibrium, and match K.

[Emaad Sohail 3F]

K is the equilibrium ratio of products over reactants and is constant for any general chemical equation. Q is for any specific concentration of reactants and products not necessarily at equilibrium.

[Preethika Praveen 2G]

Q is the ratio of products to reactants at any point during the reaction. However, K is the ratio of products to reactants only when the chemical reaction is at equilibrium.

[Thailer Phorn 1C]

Q (the reaction quotient) refers to the ratio of products to reactants at any point during a reaction. The relation to K is that K (the equilibrium constant) is the ratio of products to reactants at equilibrium.

[QUEP 2F]

Hi!

Q is the reaction quotient, and it is calculated in the same manner as K. However, Q can be calculated at any time during a reaction, whereas K is the equilibrium constant, so K may only be calculated when the reaction is at equilibrium. When Q=K, this means the reaction has reached equilibrium. If Q<K, the reaction will shift towards the products. If Q>K, the reaction will shift towards the reactants.

[OishiBhattacharya2K]

Q is found the same way as K is. It's just that Q is the ratio during any time of the reaction, and K is the ratio when the reaction is at equilibrium. Therefore when Q=K, then the reaction is at equilibrium. When K>Q, the reaction will proceed forward. If K<Q, then the reaction will proceed in reverse. A good way to remember this is looking the way the "greater-than" or "less-than" sign points. For example, when K>Q, the reaction will proceed forward, and the ">" points forward. The same is true for when K<Q. However when using this trick, you have to make sure that you are putting K before Q when writing which is greater than/less than which.

[Desiree Eshraghi 3A]

Q is the ratio of products to reactants currently. When Q = K then you know the reaction is at equilibrium.

[Arden Napoli 1E]

Hi,

K is the relationship between reactants and products when the system is at equilibrium. Q refers to the relationship between reactants and products at any given point or concentration in the system. That is why when we compare the relationship between Q and K, it can determine the shift of the system.

[Madison Kiggins 1E]

K describes the ratio of products to reactants at equilibrium. Q refers to the ratio of products to reactants at any point in a reaction. They are both calculated in the same way, so when Q>K that means there are more products than reactants so the reaction will proceed to the left, and when Q<K that means there are more reactants than products so the reaction proceeds to the right. When Q=K that means the reaction is at equilibrium.

[Jessica Sun 2I]

Q, the reaction quotient, is the ratio of products to reactants during a reaction. Q=K when a reaction is at equilibrium.

[Melody Khoshneviszadeh 3C]

K represents the ratio of products over reactants when the reaction is at the point of equilibrium and the forward/reverse reactions are the same. when the reaction is not at equilibrium we represent that product to reactant ratio with the letter Q instead to indicate that the reaction has not reached equilibrium.

[Ananya Sridharan]

Q tells us the ratio of products to reactants at any point in a reaction but K tells us the concentrations at equilibrium.

[105778693]

Q is the ratio of products to reactants at any time during the reaction (which might not necessarily be at equilibrium). K is the ratio of products to reactants during the equilibrium. Q can equal K at equilibrium only.

[Ramya_Paravastu_1H]

Q is essentially K, but the system is not as equilibrium. It is the ratio of the concentration of products to reactants.

[Polo Morales 3C]

Q is a ratio of products to reactants at any given time. Q=[P]/[R] at any point in the reaction. K=[P]/[R] at equilibrium. Therefore, they are related in that Q=K at equilibrium.