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K is general term for the equilibrium constant of products over reactants. Kp means that the values in the equilibrium constant are the partial pressures of usually gases. Kc means that the values in the equilibrium constant are concentrations of aqueous solutions
If the question just asks for K, you can choose between Kc and Kp by looking at other information in the problem. If dealing with aqueous solutions you should probably find Kc, but if dealing with gaseous solutions, it might be better to calculate Kp. This seems to be the general trend, but may not always be the case.
Madeline Phan 1J wrote:when writing the expression for k, how do you know when to use brackets or to write p in front?
You use brackets to represent concentration and you use P to represent partial pressure. For a gas, we use its partial pressure and the equilibrium constant is denoted by Kp.
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