ON THE SPECIFIC GRAVITY OF SULPHURIC ACID. 
3 
Table I. torUinued. 
HTdrtteaf 
raphuric 
acid in 
IM parts. 
Snlpboric 
ada void 
of water ■ 
= 100 pte. 
Spedfle 
gravity 
ouaervM. 
A. 
Hydrate of 
lupburic 
acid In 
IM parts, 
Huluburic 
acid void 
of aater 
s 100 pu. 
Specific 
gravity 
obaervM. 
A. 
30 
29-354 
1-2654 
+ 
0-OO46 
18 
14-673 
1-1246 
04)046 
33 
28-539 
1-2572 
+ 
45 
17 
13-862 
11165 
60 
34 
27-724 
1-2490 
+ 
44 
16 
13046 
11090 
67 
33 
20-908 
1-2409 
+ 
41 
15 
12-231 
1-1019 
71 
32 
26-093 
l-23a4 
“T 
44 
14 
11-416 
1-0953 
69 
31 
25-277 
1-22GO 
<7 
13 
10-600 
1-0887 
68 
30 
24-462 
1-3184 
+ 
47 
12 
9-783 
1-0809 
78 
29 
23-646 
1-2108 
45 
11 
K-969 
1-0743 
76 
28 
22-831 
1-2032 
+ 
43 
10 
8-154 
1-0682 
68 
27 
22-016 
1-1956 
+ 
40 
9 
7-330 
1-0614 
G6 
20 
21-200 
1-1876 
32 
8 
6-523 
1-0544 
66 
25 
2U-3&5 
1-1792 
19 
7 
6-708 
1-0477 
60 
24 
19-570 
M70C 
+ 
3 
6 
4-892 
1-0105 
Cl 
23 
18-754 
1-1626 
7 
5 
4-077 
1-0336 
56 
22 
17-399 
M519 
_ 
J5 
4 
3-262- 
1-0-268 
49 
21 
17-124 1 
M480 
_ 
15 
3 
2-446 
1-02416 
.34 
20 
16-30.8 
M410 
_ 
17 
3 
1-631 
1-0140 
22 
19 
15-493 
1-1330 
— 
29 
1 
0-815 
1 0074 
- 
8 
If the values of A are squared and tlic sum of all tlicse square* is taken, 
it vyill be found equal to 0*003507, and consequently tJ»c mean error of this 
series of experiments is = O’OOGO, or tlie probable error of a sintrle observa¬ 
tion isCOO-tl. 
This error aj)pear5 to be more considerable than oould reasonably be ex¬ 
pected, and the regularity with which the differences A proceed, •(■enis to 
show that five terms of the formula (I.) are not sufficient to express all the 
observations. As the greatest uncertainty in the detennination of the spe¬ 
cific gravity must be expected to take place in the higher degrees of con- 
eontration, I have, according to the same formula, calculated tlw most pro¬ 
bable value of the constants a. A, c and d for the convex part of the curve, 
or from = 0 toy? = 0-57, and found 
a = + 0-8358559 ± 0*0030182') 
A = + 0*08.9430* ± 0*0163718 ( ^ . x 
c =: + 0*4867978 + 01)218632 ( .^ 
rf = ~ 0*003831+ ± 0*0059963J 
If the specific gravity from p = Qiop — 0*57078 is calculated with these 
'alues of the constants, the following table is obtained • 
Table II. 
Specific gravity of sulphuric acid from p^Oiop — 0*57 at the temperature 
j Hydrate rf 
sulphuric 
add in 
100 parts. 
Acid void 
of water 
in 
100 parti. 
Specidc 
gravity 
calculated. 
Difference between tl«? obawved 
and calculated apedde gravitl 
according to 
Formula 1. 
Formula 2. 
70 
57-078 
1*59634 
+ 0*00116 
+0*01025 
69 
56*262 
1*58490 
+ 190 
+ 1000 
68 
55*447 
1*57357 
+ 243 
+ 957 
