Hello forum! My name's Patrick, and I'm taking Chemistry 212. We're learning about equilibrium and I'm constantly getting K's confused. For example: In the equation ΔG=-RT*ln(K), I have no clue whether to use the Kp value or the Kc value. Could I have used either? I just need a very thorough explanation of when and why I should use the various equilibrium constants. If you could, don't just explain this example, and please try to predict some of my confusions, because it's impossible for me to know what I'm misunderstanding. I'm usually a very good chemistry student, but this material is hitting me like a ton of bricks! Thanks so much in advance for all of your help and expertise.