Measured the PH of distilled water and was around 6.5-7. After dissolving sodium sulfate the PH decreased to 5.5. Increasing the temperature of that solution didn't affect much the PH value.
The same sample was electrolysed using a Hoffman apparatus . Measuring the PH at end of experiment showed about 10.5.
Does the PH go up when ionised ?
For a RG discussion on the pH of pure sodium sulfate (Na2SO4) aq. sol.: https://www.researchgate.net/post/What_do_you_call_the_electrolyte_of_sodium_sulfate_a_base_an_acid_or_neutral
For a classic general discussion on the effect of temperature on acid-base equilibria of aqueous solutions you may check: Herbert A. Laitinen, Walter E. Harris, “Chemical Analysis ─ An Advanced Text and Reference”, 2nd ed., McGraw-Hill, 1975, pp. 47-48.
For a RG discussion concerning to correlations used to express the temperature dependency of the equilibrium constant: https://www.researchgate.net/post/How_to_determine_coefficients_for_equilibrium_constants
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