[Devau]

Afternoon everyone, I'm looking into the equilibrium of SO2 + H2O <-> H3O + HSO3 at low pH (ranging from 3.0 to 4.0).

I have two questions:
Firstly, how can I finely control the pH to be at intervals of say, 0.2?
Secondly, I could not find a method to determine the equilibrium point, beyond spectrophotometry in the UV range which is beyond our school's lab equipment. Any ideas on how to achieve this?

If this is not feasible, could anyone suggest some tangentially related experiments that I could do?  Thank you all very much!!!

[Borek]

pH is typically controlled with buffers and that is a trivial part - but I am not convinced controlling pH (instead of measuring it) makes sense.

Can you try to describe the procedure you were hoping to follow?