Solubility of Salts in Water. 383 



but on all the duplicate experiments in each series, and will, 

 if it agrees with that obtained directly, be proof not only of 

 the correctness of the latter, but also of the accuracy of the 

 data from which it was itself derived. To plot * the results, 

 however, on such a scale as to give the second place of 

 decimals, is not so convenient as to find formulas that will 

 approximately represent the experimental results. The fol- 

 lowing satisfy this condition. M.S. = Total salt dissolved. 



(1) KC1 in Solutions of NaCl. 



M.S. 



= 34-52 + 72 0-05707 + 7i 2 0-0545. 



Or, KOI 



= 34-52-n 2-6793 + n 2 0*0545. 





(2) NaCl in Solutions of KO 



M.S. 



= 35-91 + n 2-603. 



Or, NaCl 



= 35-91-n 1-541. 



(3) KOI in Solutions of KN0 3 . 

 M.S. =34-52 + n 5*26. 



Or, KC1 =34-52-7i0-358. 



(4) KN0 3 in Solutions of KOI. 

 M.S. =31-11 + n 0-959 + n 2 0-261-ti 3 0'0065. 



Or, KNO s =31-11-72 3-185 + n 2 0-261-ti 3 0'0065. 



(5) NaN0 3 in Solutions of NaCl. 

 M.S. =87-64-? t 2-378 + y? 2 0'263-ti 3 0'01325. 



Or, Na.NO s = 87-64 -n 5'628 + 7i 2 0*263 -rc 3 0-01325. 



(6) NaCl in Solutions of NaN0 3 . 

 M.S. =35-91 + 71 3-722. 



Or NaCl =35-91 -n 1-0. 



(7) NaN0 3 in Solutions of KN0 3 . 

 M.S. =87-64 + ti6-65. 



Or, NaN0 3 = 87-64 + 71 1-03. 



(8) KNO3 in Solutions of NaN0 3 . 

 fM.S. =31-11 + m 4-429 + Ti 2 0-0663-71 3 0*00153. 

 Or, KN0 3 =31-11-71 0-293 + ti 2 0'0663-ti 3 0-00153. 



With the aid of these formulae I have constructed the 

 following Tables, representing the effect of each molecule of 

 salt present in the solvent solution on the solubility of the 

 other salt. 



* Figs. 2-4, Plate VIII., give the general form of the curves on a small 

 scale. 



t Above 9 molecules per 100 H 2 0. 



