﻿the Combination of Acids and Bases. 



35 



Ammonia and Sulphuric Acid. 



Ammonia and Oxalic Acid. 



Inc. . . . 2-967 2'959 

 8 . . . . -017 -010 



2-984 2-969 



Mean inc. corrected . 2' 976 



Inc. . . . 2*635 2-630 



8 . . . . *015 -016 



2*650 2*646 



Mean inc. corrected . 2*648 



Ammonia and Nitric Acid. 

 Inc. . . . 2*556 2-551 

 8 . . . . -010 -015 



2-566 2-566 



Mean inc. corrected . 2*566 



Ammonia and Acetic Acid. 



Inc. . . . 2-469 2*482 



8 . . . . -017 '016 



2-486 2*498 



Mean inc. corrected . 2*492 



Ammonia and Hydrochloric 

 Acid. 



Ammonia and Tartaric Acid. 



Inc. . . . 2*609 2*607 



Inc. . . . 2-365 2'354 



S . . . . -015 -015 



8 . . . . -017 -016 



2*624 2*622 



2-382 2-370 



Mean inc. corrected . 2-623 



Mean inc. corrected . 2'376 



In the following Table I have collected the foregoing results, 

 arranging the acids in the order of their thermal action : — 



Acid. 



Potash. 



Soda. 



Ammonia. 



Sulphuric acid 



3-378 

 3058 

 3 021 

 2-993 

 2-852 

 2732 



3-353 

 3-040 

 2-982 

 2-929 

 2-831 

 2-710 



2-976 

 2-648 

 2-623 

 2-566 

 2-492 

 2-376 



Oxalic acid 



Hydrochloric acid 



Nitric acid 



Acetic acid 



Tartaric acid 





It is interesting to observe how closely the results in the 

 three vertical columns agree relatively with one another. The 

 acids follow in the same order under each base ; and even the 

 differences in the amount of heat disengaged by the several acids 

 in combining with the different bases approximate in many cases 

 closely to one another. Thus the heat given out when the sul- 

 phuric acid combines with potash exceeds that given out when 

 the oxalic acid combines with the same base by o, 320, the cor- 

 responding differences in the case of soda and ammonia being 

 o, 313 and0°-328. If, in like manner, we compare the differ- 

 ences between the heat disengaged by the acetic and tartaric 

 acids, we fall upon the numbers 0°-120, 0°-121, and 0°-116. 

 Even in the case of the oxalic, hydrochloric, and nitric acids, 

 which disengage so nearly the same amount of heat, the same 

 order is observed with the three bases. It must be particularly 



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