I think Henry's Law applies whether the gas ideal or not. I think it's more important to ask if the gas reacts with the solvent; e.g., CO2 reacts with H2O to form a small amount of H2CO3. In practice, however, I see Henry's Law used in most circumstances, ideal or not, react or not (unless of course the gas is more than slightly soluble in the solvent).
SO3 + H2O ==> H2SO4 might be an example where Henry's law is not appropriate.
Can Henry's Law be used for gases that obey the Ideal Gas Law? What about gases that do not obey the ideal gas law?
when can you use/Not use henry's law?
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