Correlation of ionization and structure . y applicable,has its limitations. In some cases the preparation of a knownderivitive is a tedious process,requiring a relatively largeamount of material,and destroying that material beyond other cases the use of certain reagents is excluded,because ofthe possibility of their producing isomeric change either in theoriginal compound or in the derivitive. Sometimes the chemicalprocess does not afford sufficient criterion for proof of f this is the case physical means are resorted to. Among thephysical means that can be applied to t
Correlation of ionization and structure . y applicable,has its limitations. In some cases the preparation of a knownderivitive is a tedious process,requiring a relatively largeamount of material,and destroying that material beyond other cases the use of certain reagents is excluded,because ofthe possibility of their producing isomeric change either in theoriginal compound or in the derivitive. Sometimes the chemicalprocess does not afford sufficient criterion for proof of f this is the case physical means are resorted to. Among thephysical means that can be applied to the problem are color,density,heat of combustion,solubility,melting point,opticalproperties,and finally electrical conductivity. Some of thesedevices,for instance color and density,can be used only to distin-guish dynamic isomers,but electrical conductivity,with which thispaper will deal exclusively,is generally applicable to allcompounds which ionize even to the slightest extent. Among the advantages of the electrical conductivity method. it might be noted that it rapid,and economical in that it doeenot destroy the aubstance under consideration and that only asmall amount of the substance,less than a gram,is this amount must be very pure if accurate results*are to behoped for;which,by the way,is not a disadvantage,but rather,inthe end,a helpful necessity. Electrical conductivity results directly from ionization,andit is the purpose of this investigation to show that a more inti- I mate relation,than has been discovered heretofore,exists betweenthe ionization of a substance and its chemical structure, hasbeen pointed out by Derick(l). This paper deals in generalwith the straight-chain^ define acids,and in particular V7ithallyl acetic acid,CH^-CH-CH,-CH^-COOH,testing Dericks law of I place influence by means of data obtained experimentally and ! • bibliographically. I HISTORICAL. 0stwald(2),in 1889,was the first to recognize the existenceI of a relation betwe
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