398 

 whei© 



Dr. W.W.J. Nicolon the 



M.V. = molecular volume of salt-solution ; 

 1800 = 100 H 2 ; 

 nM.W. = molecular weight of the salt multiplied by 

 the number (n) of salt molecules present 

 per 1 00 water molecules ; 

 8 = density of solution at 20° referred to water 

 at 20°. 

 When this is done we obtain the volume occupied at t° C. by 

 n molecules of salt and 100 molecules of water. 



In the following Table I have employed the values of M.V. 

 at 20° for the various solutions, as given by calculation 

 according to the method described in a previous paper*. 

 These values are sufficiently correct for the purposes of this 

 paper, and no error is introduced by employing them, or by 

 considering the salt-solutions as possessing the precise mole- 

 cular composition aimed at. In the table the molecular 

 volumes of water at intervals of 10° are given in the first 

 column, and in the others are the molecular volumes of the 

 salt-solutions at the corresponding temperatures. On com- 

 paring the volumes of the salt-solutions with those of water, 

 it is found that the maxima are moved up the temperature- 

 scale. Thus all the NaCl solutions and 3, 5, and 7 KC1 have 





Table V. 



(see also fig. 8). 





t°. 



Water. 



2NaCl. 



41S T aCl. 



6Na01. 



8NaCl. 



lONaCl. 



o 

 20 



1800-0 



1836-1 



1876-6 



19200 



1964-5 



20084 



30 



46 



42-3 



83-7 



27-9 



73-0 



17-3 



40 



10-7 



49-4 



91-5 



36-5 



82-0 



26-7 



50 



18-4 



57-6 



1900-2 



45-6 



91-5 



36-4 



60 



27-2 



66-7 



9-6 



55-3 



2001-4 



46-6 



70 



37-4 



76-9 



19-8 



65-5 



11-8 



57-2 



80 



48-7 



88-0 



30.7 



764 



22-7 



68-2 



90 



61-1 



1900-1 



42-5 



87-8 



340 



79-6 



100 



74-6 



13-2 



55-0 



99-8 



45-8 



91-5 



t°. 



KOI. 



3KC1. 



5KC1. 



7KC1. 



2NaN0 3 . 



4NaN0 3 . 



o 



20 



1827-8 



1886-8 



1948-8 



2011-8 



1859-0 



1922-5 



30 



33-2 



931 



55-7 



19-4 



66-1 



30-6 



40 



39-7 



1900-4 



63-5 



27-6 



74-2 



39-8 



CO 



47.5 



8-7 



72-1 



36-5 



83-3 



49-9 



60 



56-4 



17-9 



81-5 



46-0 



93-4 



61-0 



70 



666 



28-2 



91-8 



56-3 



1904-5 



731 



80 



78-0 



39-4 



2002-9 



67-1 



16-6 



86-2 



90 



90-6 



51-5 



14-8 



78-7 



29-6 



2000-2 



100 



1904-4 



64-7 



27-6 



90-8 



43-7 



15-2 



* Phil. Mag. January 1886. 



