

in Aqueous Salt- Solutions. 373 



the apparent concentrations ; but since the exact point of 

 neutrality was difficult to observe, two series of experiments 

 were made to eliminate as much as possible the experimental 

 error and the sum of the apparent concentrations taken to 

 represent C 2 — x. Consequently, in the tables for sodium car- 

 bonate there are two extra columns (I. and II.) with the 

 sum of the numbers contained in them given under the 

 column C 2 — x. The temperature at which all the experiments 

 on sodium carbonate was made was 24°*2 C, and the co- 

 efficient of velocity k for sodium hydrate at this temperature 

 is taken at 6*23. 



N 



(mol.) Sodium Carbonate. 





t. 







I. 



1900 



IT. 



1900 



11 — T 



X. 



G-x. 





38-00 



000 



48-70 





2 



18-15 



1810 



3625 



1-75 



46-95 





4 



17 40 



17-27 



34-67 



3-33 



45-37 



(150)X10- 6 



8 



16-55 



16-65 



3320 



4-80 



43-90 



129 



12 



15-95 



15-99 



31-94 



6-06 



42-64 



138 



20 



15-15 



1515 



30-30 



7-70 



41-00 



135 



30 



14-72 



14-74 



29 46 



854 



40-16 



112 



50 



13-23 



13-26 



26-49 



11-51 



3719 



136 



85 



11-80 



11-95 



23-75 



14-25 



3445 



136 



155 



10-10 



9-97 



20-07 



17-93 



30-77 



141 













Mean: 



= 132-4 xlO" 6 



K = O01738. 



A =0-00804, or 2-12 per cent, of salt hydrolysed. 



N 



10 



(mol.) Sodium Carbonate. 



t. 



I. 



II. 



a 2 -x. 



X. 



G-x. 









9-40 



9-40 



18-80 



000 



48-70 





2 



9-07 



905 



1812 



068 



48-02 





4 



8-85 



8-10 



1695 



1-85 



46 85 



(625) X 10- 6 



8 



7-85 



7-60 



15-45 



3-35 



45-35 



815 



12 



7 30 



7-25 



14-55 



4-25 



4445 



839 



16 



695 



6-90 



13-85 



4-95 



4375 



854 



20 



6-60 



6-62 



13-22 



5-58 



43-12 



880 



24 



6-40 



6-35 



1275 



6-05 



42-65 



874 



32 



5-82 



6-08 



11-90 



6-90 



41-80 



885 



66 



5-12 



510 



10-22 



8-85 



40-12 



741 













Mear 



i=S41xl0- 6 



K = (M)1954. 



A =0-00596, or 3*17 per cent, of salt hydrolysed. 



