## Reaction Quotient

Samantha Chung 4I
Posts: 77
Joined: Wed Oct 03, 2018 12:16 am

### Reaction Quotient

As I was completing the reading section, I noticed that there was a "reaction quotient" - what is the difference between this sand the K value?

Emma Scholes 1L
Posts: 62
Joined: Fri Sep 28, 2018 12:18 am

### Re: Reaction Quotient

K is used to describe a reaction at equilibrium. The reaction quotient is used to describe a reaction that is not at equilibrium. If the reaction quotient is equal to K, you know that the reaction is at equilibrium.

Becky Belisle 1A
Posts: 81
Joined: Fri Sep 28, 2018 12:18 am

### Re: Reaction Quotient

The reaction quotient still has the same formula as the equilibirum constant, except for the equilibrium constant the values used are the ones at equilibrium.

Chris Freking 2G
Posts: 60
Joined: Fri Sep 28, 2018 12:29 am

### Re: Reaction Quotient

K refers to the [P]/[R] ratio at equilibrium. Although Q also refers to the [P]/[R] ratio, it can be measured at any point in time in a reaction--including equilibrium.
If Q<K, then the forward reaction (products forming) is favored.
If Q>K, then the reverse reaction (reactants forming) is favored.
If Q=K, then the reaction is at equilibrium and reactants and products are being formed at equal rates.

megan blatt 2B
Posts: 61
Joined: Fri Sep 28, 2018 12:28 am

### Re: Reaction Quotient

Going off of the previous comments, Q is the reaction quotient which is calculated the same way that K is. However, K is used once the reaction has reached equilibrium while Q is used for any other point in the reaction while it is reaching equilibrium.

Jonny Schindler 1A
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

### Re: Reaction Quotient

Both K and Q represent the ratio of products to reactants, but using Q implies that the reaction is not at equilibrium and the ratio will shift until equilibrium is reached. At this point, the ratio is represented as K