What is a numerical value of the ratio of products to reactants, only at a specified temperature is called?

Aug 30, 2017

Well, equilibrium constants are temperature-dependent.

$K = \frac{{\left[C\right]}^{c} {\left[D\right]}^{d}}{{\left[A\right]}^{a} {\left[B\right]}^{b}}$

for the reaction

${\overbrace{a A + b B}}^{\text{reactants" rightleftharpoons overbrace(cC + dD)^"products}}$,

where $a , . . . , d$ are the stoichiometric coefficients of corresponding substances $A , . . . , D$.

And with temperature variations, we get a change in the value of $K$. Higher temperatures favor the forward reaction for endothermic reactions and the backward reaction for exothermic reactions.

It is known that ${K}_{w}$ varies directly (as opposed to inversely) with temperature, as the autoionization of water is endothermic (involves breaking an $\text{O"-"H}$ bond!).

And thus, $\text{pH}$ and $\text{pH}$ are also temperature-dependent. See here.