[noknok]

If I am trying to determine the pH of a solution, does it matter how I maintain the temperature?  The one I've seen used often is using a waterbath, but can you use a heatblock?  I was reading USP guidelines (<791>) and it doesn't mention anything on how to maintain temperature.

[AWK]

http://reagecon.com/pdf/technicalpapers/Effects_of_Temperature_on_pH_v4-_TSP-01-2.pdf
http://chem.libretexts.org/Core/Physical_Chemistry/Acids_and_Bases/Aqueous_Solutions/The_pH_Scale/Temperature_Dependent_of_the_pH_of_pure_Water