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I am having one doubt in weight percent standard state...Please see the quote(Taken from the legendary thermodynamics book by David Gaskell):

If deviations from Henry's law occur below 1 wt %,then the procedure is to extrapolate the Henry's law line upto 1 wt% and conceive that as standard state,which will be hypothetical.But it does not matter for thermodynamic treatment.

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Firstly,why are we assuming a negative deviation here.I even am not motivated how to judge between positive and negative deviation.Secondly,Could someone explain the quote with reference to the diagram provided?I do not understand a single thing between the quote and the picture.

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    $\begingroup$ Rajorshi - Please edit your question to include the source of the quote. $\endgroup$
    – MaxW
    Jan 18 at 7:18

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