Effect Of Temperature On pH of Buffer?

Question

Can anyone plz explain to me about the effect of temperature on buffer? Is it because the dissociation of the acid into hydrogen ion an endothermic reaction, so that when temperature increases, pH decreases?

Answer 1

This shows the effects on a buffer solution as pH changes:

http://www.automatedaquariums.com/tecph_4.htm
http://www.stanford.edu/~cpatton/may99.htm

oh, this one is good:
http://www.sigmaaldrich.com/Brands/Fluka___Riedel_Home/Bioscience/BioChemika_Ultra/Biological_Buffers.html

The increased temperatures increase the overall energy of the system, increasing hydrogen dissociations and atomic interactions. This leads more atoms to be ions at any given time, thus lowering the pH to the acidic side.

Answer 2

temperature does not consequence pH that plenty. because of the fact the ionisation relies upon on an potential function the temperature can consequence it, yet pH is a log function of the ionisation and so the substitute is quite little. Temperature could additionally develop the quantity a small quantity and this could decrease the concentration of H ions, increasing the pH fairly. yet this quantity is so small as to be irrelevent.

Answer 3

Shofix gives a very good link (the third one).

"dpH(S)/dT standard change of pH value per degree centigrade. It can be positive or negative"

Depending on the reactions involved (endothermic or exothermic) there will be a decrease or increase of pH with an increase of temperature. For example for Tris-HCl you have dpH/dT=-0.028 pH units/ degC, while for Tetraoxolate +0.070