Aqueous Solutions of Acids and Alkalies. 



305 



greatest chemical strength, has 5£ atoms of water, or one- 

 third of the quantity which belongs to the hydrate that sus- 

 tains the greatest amount of condensation. 



Messrs. Playfair and Joule (Phil. Mag., vol. xxvii. pp. 495, 

 521, 527) are of opinion that the atomic measure of muriatic 

 acid is, in concentrated solutions, equal to twice the atomic 

 volume of water (p. 521); but that in dilute solutions it is 

 sometimes twice (p. 495) and sometimes only once (pp. 521, 

 527) the atomic volume of water. They do not specify the 

 point at which they conceive the measure to change suddenly 

 from 2 volumes to 1 volume. 



Table VI. — Nitric Acid. 

 N 2 O 5 = 677*036 grs. Temperature 62° F. 



