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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Devau on June 27, 2018, 10:31:11 PM

Title: Measuring Equilibrium Constant at various pH *delete me*
Post by: Devau on June 27, 2018, 10:31:11 PM

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!!!

Title: Re: Measuring Equilibrium Constant at various pH *delete me*
Post by: Borek on June 28, 2018, 03:55:12 AM

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?