ON THE BOILING POINTS OF AQUEOUS SOLUTIONS OF ELECTROLYTES. 207 



Lithium Nitrate. 



Grms. Salt 



added to 



50 c.c. 



Solvent. 



Elevation 



of Boiling Composi 



Point 



•1820 



■5462 



•9032 



1-6328 



3-3990 



•103 

 •193 

 •278 

 ■441 

 •830 



Per cent. 



tion. 



■366 



•09 



•793 



T9 



•43 



Grm. 



eqs. per 



Litre. 



Ionization 

 Co-eff. 



•041 

 •132 

 •284 

 •433 

 •921 



•686 

 •648 

 •598 

 •562 

 •494 



Molecu- 

 lar 

 Weight. 



68-7 

 68-0 

 68-3 

 68-4 



68-8 



Mean molecular weight found, 

 * International value, 



Ammonium Bromide. 



68-4. 

 69-07. 



Grms. Salt 

 added to 

 50 c.c. 

 Solvent. 



Elevation 



of Boiling 



Point. 



■275 

 •542 



Per cent. 

 Composi- 

 tion. 



Grm. 



eqs. per 



Litre. 



Ionization 

 Co-eff. 



Molecu- 

 Weight. 



•4134 



•842 



2-735 



5-427 



•368 

 •749 



•754 

 •688 



100-1 

 96-3 



Ammonium Chloride. 



Mean molecular weight found, 98*2. 

 International value, . 98 '03. 



Potassium Iodide. 



Grms. Salt 

 added to 

 50 c.c. 

 Solvent. 



Elevation 



of Boiling 



Point. 



Per cent. 

 Composi- 

 tion. 



Grm. 



eqs. per 

 Litre. 



Ionization 

 Co-eff. 



Molecu- 

 lar 

 Weight. 



1 



•7186 

 2-5382 



•351 

 1-010 



4-66 

 14-44 



•280 

 •962 



•768 

 •600 



173-1 

 160-9 



Mean molecular weight found, 167. 

 International value, . 166-00. 



Grms. Salt 



added to 



15 c.c. 



Solvent. 



Elevation 

 of Boiling 



Per cent. 

 Composi- 



Grm. 

 eqs. per 



Ionization 

 Co-eff. 



Molecu- 

 lar. 



Point. 



tion. 



Litre. 



Weight 



•1260 



T28 



'850 



T41 



•844 



53-4 



•3422 



•363 



2 



26 



■412 



•704 



53-8 



•6552 



•573 



4 



26 



•793 



•653 



54T 



•7604 



■760 



4 



94 



•825 



•650 



53-6 



•8730 



•892 



5 



61 



1055 



•630 



51-9 



1-0476 



1-076 



6 



65 



1-255 



•620 



53-5 



1-2812 



1-329 



8 



01 



1-531 



•606 



54-5 



1-5620 



1-662 



9-60 



1-852 



•598 



52-2 



Mean molecular weight found, 

 International value, 



53-5. 

 53-52. 



Potassium Bromide. 



Grms. Salt 



added to 



50 c.c. 



Solvent. 



Elevation 



of Boiling 



Point 



•4254 

 •6854 

 •8813 

 •0293 

 •2945 

 •5705 

 •9564 

 ■3074 



■120 

 T73 

 •212 

 •238 

 •262 

 •324 

 •386 

 •451 



Per cent. 

 Composi- 

 tion. 



Grm. 



eqs. per 



Litre. 



Ionization 

 Co-eff. 



Molecu- 

 lar 

 Weight. 



■85 



092 



•796 



122-7 



1-36 



T32 



•774 



122 



7 



1-75 



•164 



•758 



120 



6 



2-03 



•204 



•774 



118 



4 



255 



•256 



•732 



118 







3-07 



•308 



•730 



116 



6 



3-88 



•392 



•706 



116 



2 



4-45 



•472 



•692 



114-7 



Mean molecular weight found, 118-73. 

 International value, . 119-11. 



In the tables given above, whether these have been molecular weight calculations 

 or a determination of the value of the boiling-point elevation constant, the results are 

 in close agreement with the results of other experimental methods and with theory. 



It will therefore be seen that, when moderately dilute or dilute solutions are under 

 investigation, the method which has been adopted gives greatly increased accuracy to 

 results whether these are molecular-weight determinations by the boiling-point method 

 or values of the elevation of the boiling-point constant. 



It may also be noted that, as the manner in which the ionization coefficients were 

 obtained and the formula used in calculating values of the elevation constant, were 

 based on the dissociation theory, the latter has been put to a somewhat severe test, 

 and as the results agree so fully with theory, it has been entirely favourable. 



* International atomic weights, 1904. 



