Question

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

Answer 1

Well, equilibrium constants are temperature-dependent.

`K = ([C]^c[D]^d)/([A]^a[B]^b)`

for the reaction

`overbrace(aA + bB)^"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 `"O"-"H"` bond!).

And thus, `"pH"` and `"pH"` are also temperature-dependent. See here.