## Equilibrium constant help

SaniShabgahi3N
Posts: 21
Joined: Wed Sep 21, 2016 2:57 pm

### Equilibrium constant help

Do equilibrium constants (KC) exclude liquids and solids? And if yes, is it the same as the Kp (thinking back to the most recent quiz we took)?

Natalie Rotstein 3J
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

### Re: Equilibrium constant help

The calculation of the equilibrium constant does exclude liquid and solid concentrations. Though Kc and Kp are both forms of the equilibrium constant, Kc is when calculating it from molarity (for aqueuous solitions and gases), while Kp is when calculating from partial pressure (generally used more for gases). To calculate Kc, you use the equation [C]c[D]d/[A]a[B]b. For Kp, it is the same format except using P(A,B,C, or D) (partial pressures) instead of the molarity.