Gibbs and K value

[WYacob_2C]

Can someone explain how the K value can impact the sign of delta G. Thank you in advance.

[Lara Kristine Bacasen 1L]

The K value can tell you if it is spontaneous or not. A spontaneous reaction has a negative delta G and a large K value. A non-spontaneous reaction has a positive delta G and a small K value.

[HuyHa_2H]

The effects can be seen in the equation deltaG = -RTlnK. If K is greater than 1, then delta G is negative indicating spontaneity whereas if K is less than 1, then delta G is positive indicating a nonspontaneous process.

[Asha Agarwal 1E]

If the reaction is at equilibrium, then Q = K, so you can substitute in K for Q and the ∆G will depend on K.