## Question Regarding K and Q

$\Delta G^{\circ}= \Delta H^{\circ} - T \Delta S^{\circ}$

$\Delta G^{\circ}= -RT\ln K$

$\Delta G^{\circ}= \sum \Delta G_{f}^{\circ}(products) - \sum \Delta G_{f}^{\circ}(reactants)$

Peter2715
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Question Regarding K and Q

For the formula Delta G = Delta G Nought + RTlnQ could someone help clarify the difference between the constants K and Q? since they are supposed to represent (Conc. of Products) / (Conc. of Reactants) right?

PaigeBlack
Posts: 32
Joined: Fri Sep 25, 2015 3:00 am

### Re: Question Regarding K and Q

K represents ratio of products over reactants when the reaction is at equilibrium while Q represents this ratio at any time during the reaction, not necessarily at equilibrium.

TeaK1C
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

### Re: Question Regarding K and Q

The person above is correct, K is the ratio of products/reactants when the equation is currently at equilibrium. Q is used at any point of the reaction to figure out if you are at equilibrium or if you need to add more of something or reduce part of the reaction.