when to use Kc vs Kp

[Sarah Blake-2I]

When writing out the Kc or Kp, how do we know when to show the values in brackets (concentration) vs using P and a subscript of the element. What I am trying to ask is do we only write the values in brackets if we are calculating Kc?

[KeyaV1C]

The sure brackets around the compound just indicate that you’re writing the concentration of the compound => [] = concentration. You use p to calculate kp only when the compounds in the reaction are gases.

[Jamie Lee 1F]

Kc is defined by molar concentrations, while Kp is defined by partial pressures of gases. You typically use brackets for K and Kc, and parentheses for Kp.

[Jared Khoo 1G]

By using brackets you are denoting a value that is concentration, therefore you should plug in concentrations with the units molL^-1, which will get you K_c.

[Matt F]

As others mentioned, brackets denote concentration (in mol.L^-1), so you wouldn't use them when calculating partial pressure for Kp. However, just because you are given all gases does not necessarily mean you will be calculating Kp, so pay attention to what the question asks and what values are given

[IScarvie 1E]

The brackets are strictly used to show that we are dealing with molar concentrations, and are used to solve for kc. Parenthesis and kp are used to deal with pressure

[Maya Gollamudi 1G]

The brackets indicate that the number inside is a concentration (molarity). Parentheses mean that the number is a partial pressure of a gas.

[AronCainBayot2K]

Kc usually deals with molar concentration and the activity of chemical reactions. Kp deals with partial pressure only when the products and reactants are forms of gasses.

[Betania Hernandez 2E]

Kc uses brackets because it is dealing with the molar concentration while it isn't used with Kp because it is dealing with gases which is in the units of bar or atm.

[JohannaPerezH2F]

we use Kc or Kp according to the the information we are given and the values we are looking for. for example we would use Kp when atm is used and Kc when moles/liter are used

[Helen Struble 2F]

As others mentioned, brackets denote concentration (in mol.L^-1), so you wouldn't use them when calculating partial pressure for Kp. However, just because you are given all gases does not necessarily mean you will be calculating Kp, so pay attention to what the question asks and what values are given

Brackets do denote concentration, but it's important to note that because concentration is used as an approximation for chemical activity, the typical units for concentration are omitted when calculating Kc.

[005324438]

The brackets represent molarity, and the P represents partial pressure. The only time to use P is when we are dealing with gasses, it should be (g) as a subscript in the chemical equation this calculates Kp. If it has an (aq) it is a solution with a concentration, and we can use the bracket, this calculates Kc.