# Why is it necessary to maintain a constant temperature in an experiment to measure an equilibrium constant?

Jan 29, 2017

This is only necessary for temperature related equilibrium constants not for solving $\text{Ka ,Kp, Kb}$ but solving for $\text{Kc}$ as a single experiment will have only one constant temperature. Different reactants will have different volume at different temperature because of the pressure will rise and for calculating Kc we sometimes need to calculate the number of moles from pressure volume and temperate which always should be a constant temperature.
$\text{PV = nRT}$
If $\text{T} \mathmr{and} t e m p e r a t u r e$ is not constant the $\text{Kc}$ would be wrong. But for fall or rise in temperature the $\text{Kc}$ values can be shown in a graph