406 M. J. A. Groshans on the Specific Gravity of certain 



These data are taken from the tables of Landolt and 

 Bornstein. 



The second table, B, shows what we may call (in a certain 

 sense) the opposite phenomenon. This table gives the den- 

 sities of solutions containing one molecule of the soluble body 

 with whole numbers (equal for the two bodies) of molecules 

 of water ; one sees clearly that the solutions which contain 

 potassium are heavier than those containing sodium. 



Table B. 

 Solutions of analogous compounds of Potassium and Sodium, 

 containing one molecule of the soluble substance with n 

 molecules of water, H 2 0. 



Thomsen's experiments 



*=18°. 



n 

 H o 0. 



100 

 200 



200 



200 



100 

 200 



100 

 200 



100 

 200 



200 



Potassium 

 compound. 



Observed 



density. 



Sodium 

 compound. 



Observed 

 density. 



KC1 



1-0258 

 1-0136 



NaCl 



1-0234 

 1-0118 



KBr 



1-0236 



NaBr 



missing 



KI 



1-0335 



Nal 



1-0318 



KN0 3 



1-0336 

 1-0173 



NaN0 3 



1-0311 

 1-0160 



KOH 



1-0284 

 1-0144 



NaOH 



1-0246 

 1-0124 



K 2 C0 3 



missing 



Na 2 C0 3 



1-0593 

 1-0306 



K 2 S0 4 



1-0380 



Na 2 S0 4 



1-0350 



Difference. 



0-0024 

 0-0018 



0-0017 



0-0025 

 0-0013 



0-0038 

 0-0020 



0-0030 



Nicol's experiments 



£=20°. 



100 

 200 



50 



100 



200 



KC1 



10257 

 1-0131 



NaOl 



1-0226 

 1-0115 



KN0 3 



1-0652 



NaN0 3 



1-0598 



KC10 3 



1-0412 



NaC10 3 



1-0384 



K 2 S0 4 



1-0376 



Na 2 S0 4 



1-0347 



00031 

 0-0016 



0-0054 



0-0028 



0-0029 



Gerlach's experiments 



* = 15°. 



50 

 100 

 200 



K 2 C0 3 



1-1249 

 1-0654 

 1-0334 



Na 2 00 3 



1-1114 

 1-0586 

 1-0301 



0-0135 

 0-0068 

 0-0033 



Kremers's experiments 



t = 19°'5 



100 

 200 



KBr 



1-0453 

 1-0230 



NaBr 



1-0428 

 1-0216 



0-0025 

 0-0014 



