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Changes to K value

Posted: Tue Jan 15, 2019 3:28 pm
What factors effect the K value and which do not? (for example temperature, pressure, volume, concentration)

Re: Changes to K value

Posted: Tue Jan 15, 2019 3:29 pm
Only changes in temperature change the K value.

Re: Changes to K value

Posted: Tue Jan 15, 2019 3:34 pm
When you are looking at changes in the value of K you want to look at whether the reaction is endothermic or exothermic because that will give you a hint as to how K will change if temperature is increased or decreased. For example, if temperature is increased for an endothermic reaction, K increases because products are favored as their product will "use up" some of the heat from the increased temperature. Hope that adds a bit to the conversation :).

Re: Changes to K value

Posted: Tue Jan 15, 2019 4:33 pm
Only temperature effects and changes the equilibrium constant K. Pressure, volume, and concentration adjust to match the same result as the equilibrium constant.

Re: Changes to K value

Posted: Tue Jan 15, 2019 5:37 pm
The reason why only temperature changes the K value is because the other variables e.g. pressure only really change the initial concentration of reaction or product. However, because of this, the Q value changes which will shift the chemical equation.

Re: Changes to K value

Posted: Thu Jan 17, 2019 10:22 am
Only temperature will change the K value. Temperature changes the value of K depending on if the reaction is endothermic or exothermic. For a change in the concentration and pressure in the products or reactants, the system will eventually come back to equilibrium over time so the ratio of the products to reactants after the added products or reactants will be the same as the initial equilibrium concentrations/pressures.

Re: Changes to K value

Posted: Thu Jan 17, 2019 11:41 am
Only temperature can affect the K value

Re: Changes to K value

Posted: Thu Jan 17, 2019 11:44 am
You could also potentially change K by multiplying the reaction equation by a whole number. If you double the stoichiometric coefficients of everything in the equation, the K will become K^2, which will either increase K is K > 1 or decrease K if K < 1.

Re: Changes to K value

Posted: Thu Jan 17, 2019 1:23 pm
Temperature is the only modification that can affect the K value. Pressure, volume, and concentration does not affect the K value but it does affect which side of the reaction is favored more.

Re: Changes to K value

Posted: Thu Jan 17, 2019 1:50 pm
only temperature affects the K value