WORK OF J. N. PEARCE. 



81 



NITRIC ACID. 



A moderately concentrated solution was first made up, care having been taken that 

 the acid used contained none of the oxides of nitrogen in solution. 



Dilute portions of this were standardized volumetrically against a solution of 

 potassium hydroxide. 



Table 62. Nitric Acid Data for Freezing-point and Conductivity Measurements, 



Specific Gravity, and Hydrates. 



Freezing-point. 



in 



0.025 



0.05 



0.075 



0.10 



0.25 



0.50 



0.75 



1.00 



1.5 



2.0 



0.09035 



0.1791 



0.2678 



0.3547 



0.8869 



1.798 



2.766 



3.749 



5.955 



8.383 



A/tn 



3.6140 



3.5830 



3.5713 



3.54701 



3.4576 



3.597 



3.681 



3.749 



3.970 



4.191 



1.9430 

 1.9263 

 1.9200 

 1.9069 

 1.9073 

 1.9341 

 1.9736 

 2.0156 

 2.1344 

 2.2532 



a 



94.30 

 92.63 

 92.00 

 90.69 

 90.73 



Hydrates. 



m 



0.025 



0.05 



0.075 



0.10 



0.25 



0.5 



0.75 



1.00 



a 



2.00 



99.08 

 9S.65 

 96.87 

 95.43 

 93.99 

 91.38 

 89.17 

 85.93 



74.71 



A/to 



3.7028 



3.6948 



3.6617 



3.6348 



3.6062 



3.559 



3.518 



3.450 



3.249 



3.6140 



3.5830 



3.5713 



3.5470 



3.5476 



3.597 



3.680 



3.749 



4.191 



L' 



3.6124 



3.5790 



3.5640 



3.5370 



3.5210 



3.544 



3.595 



3.639 



3.944 



M 



1.180 

 2.880 



9.78 



H 



1.57 



2.88 



4.89 



Conductivity. /i^0=237.07, 



40 

 20 



13.33 

 10 



4 



2 



1 



334 



1.0 

 0.5 



y-i 



234.89 

 233.88 

 229.66 

 226.24 

 222.82 

 216.63 

 211.43 

 203.72 

 177.15 



a 



99. OS 

 98.65 

 96.87 

 95.43 

 93.99 

 91.38 

 89.17 

 S5.93 

 74.71 



Specific gravity. 



in 



0.025 



0.05 



0.075 



0.10 



0.25 



0.50 



0.75 



1.00 



2.00 



Sp. gr. 



1.00093 

 1.00180 

 1.00265 

 1.00350 

 1.00848 

 1.01686 

 1.02503 

 1.03360 

 1.06700 



Correction, 

 per cent. 



0.065 

 0.134 

 0.207 

 0.281 

 0.728 

 1.465 

 2.325 

 2.945 

 5.909 



Like hydrochloric acid, dilute solutions of nitric acid exhibit no tendency to form 

 hydrates. No appreciable power to combine with water is manifested until the con- 

 centration 0.75 normal is reached. The amount of total combined water, then, 

 increases with the concentration. The same results are obtained for the values of 

 H. For curves representing the values of H and M see figs. 24 and 25, page 66. 

 The data are given in table 62. 



SULPHURIC ACID. 



Dilute portions of the mother-solution were titrated against the standard potas- 

 sium hydroxide used for the previous acids. 



The results are given in table 63, the curves in figs. 30 and 31. 



In dilute solutions no water is held in combination. The total amount of water 

 held in combination by the acid, and the hydration per molecule, increase with con- 

 centration from 0.75 to 2 normal. 



