constants

[aaronharouni]

Whats the difference betwen Kc Kp and Q?

[Cienna Henry 1J]

Kc is the equilibrium constant in terms of concentration, Kp is the equilibrium constant in terms of pressure, and Q is the reaction quotient which can be equal to K.

[Alma Flores 1D]

Also, the reaction quotient, Q, is compared to the equilibrium constant, K, to determine which direction a reaction will proceed. Q, Qc, or Qp are calculated the same way as K.

[005113695]

Hi! Kc, Kp, and Q are all very similar. Kc is just the equilibrium concentration while Kp is the pressure at equilibrium. Q finds which way the reaction is going.

[caseygilles 1E]

Kc = equilibrium constant: concentration (mol / L)
Kp= equilibrium constant: pressure (bar)
Q = reaction quotient, calculated the same way as Kc or Kp but can be calculated at any time during the reaction (at equilibrium or not)
The value of Q gives us vital information as to the future nature of the reaction. If Q<K, then the reaction will tend to form more products until Q=K (reaction shifts right). If Q>K, then the products will be consumed to form reactants until Q=K (reaction shifts left).