OP ARTS AND SCIENCES. 



43; 



pose the sulphates present was introduced, and the clear solution heated 

 to boiling", and kept boiling for a minute or two. Tlie acetic acid em- 

 ployed was the C. P. article of commerce, and contained thirty-five per 

 cent of absolute acid. The amounts of it used — 20%, 30%, 40%, 50% 

 by volume — correspond to 7%, 10.5%, 14%, 17.5% of absolute acid. 

 Tlie formic acid contained twenty-seven per cent of pure acid, and 

 when it is said that there was in solution 5.4% of it, the absolute acid is 

 meant ; but it was the weaker acid, to the amount of 20% of the entire 

 volume, which was actually used. The experiments were made in sets, 

 and so appear in the record, in consequence of changes (due to slight 

 depositions from time to time) in the strength of the test solution, 

 which necessitated redeterminations of standard. 



(1 



i ('"^ 



f (5 



J,o 



I (7 

 I (« 



(9 

 (10 



1(1-' 



(13 

 (14 



(15 

 (IG 



(17 

 (18 



(10 



(■20 



(21 

 (22 

 (23 



(24 

 (25 



(2G 

 1(27 



Weight of Solution. 



52.7370 grm. 

 52.7610 " 



52.7G20 " 

 41.«010 " 



52.9420 " 



53.0200 " 



10 0300 " 



10.G960 " 



21.1030 " 



21.1480 " 



21.0810 " 



21.1G70 " 



21.0020 " 



21.2310 " 



10.4370 " 



lO.Go'JO " 



10 4870 " 



10.8820 " 



10.4700 " 



107410 " 



52.39G0 " 



52.4140 " 



52.0350 " 



52.5000 " 



52.4830 " 



52.3700 " 



52.0420 " 



TiO, found. 



0.3177 grm. 



0.3180 " 



0.3076 " 



0.2436 " 



0.3381 " 



0.3384 " 



O.0G67 " 



0.0671 " 



0.1285 " 



0.12'JO " 



0.1248 " 



0.1259 " 



0.1270 " 



0.1279 " 



0.0G17 " 



0G29 " 



0.0618 " 



0.0637 " 



0.0G15 " 



0.0627 " 



0.339G " 



0.3378 " 



0.3340 " 



0.3372 " 



\ 0.3366 1 '•• 



I 0.3363 II " 



0.3348 " 



0.3374 " 



Ti0.> in 50 grm. 



0.3012 grm. 

 0.3012 " 



0.2912 " 



0.2914 " 



0.3193 " 



0.3191 " 



0.3137 " 



0.3137 " 



0.3044 " 



0.3049 " 



0.2960 " 



0.2974 " 



0.3015 " 



0.3012 " 



0.2956 " 



0.2950 " 



0.294G " 



0.2940 " 



0.2938 " 



0.2919 " 



0.3230 " 



0.3222 " 



0.3262 " 



0.3208 " 



0.3207 " 



0.3204 " 



0.31 9G " 



0.3205 " 



Mode of Precipitation. 

 / By ammonia. 



I By ammonia and ex- 

 C cess of acetic acid. 



> By ammonia. 



) By acetic acid 7% 

 ) by volume. 



[ By ammonia. 



} By acetic acid 14% 

 f by volume. 



By ammonia. 



By acetic acid 10 5% 

 by volume. 



By acetic acid 14% 

 by volume. 



By formic acid 5.4% 

 by volume. 



By ammonia. 



By acetic acid in 

 distinct excess. 



\ By acetic acid 17.5% 

 f by volume. 



