72 
Dr. Thomson on Oxalic Acid. 
Salts. 
Weight 
Composition. 
obtained. 
Acid. 
Base. 
Oxalate of Ammonia 
9-4 
7 
2.4 
— Magnesia* 
9-5 
7 
2.5 
Soda 
11.0 
7 
4-0 
— — — Lime 
11.2 
7 
4-2 
• — — Potash 
15.6 
7 
8.6 
— — — Strontian 
17.6 
10.6 
/ 
— — - — - Barytes - 
17.0 
7 
10.0 
The composition of these salts reduced to 100 parts, is given 
in the following table. 
Oxalate of 
Ammo- 
nia. 
Ox. of 
Mag- 
nesia. 
Ox. of 
Soda. 
Ox. of 
Lime. 
Ox. of 
Potash. 
Ox. of 
Stron- 
tian. 
Ox. of 
Barytes. 
Acid 
74-45 
73.68 
63.63 
62.30 
44-87 
39-77 
41.16 
Base 
25-53 
26.32 
3^-37 
37-50 
55.13 
60.23 
38.84 
Total 
100. 
TOO. 
IOO. 
100 
IOO 
100 
IOO 
* The oxalate of magnesia was obtained by neutralizing the oxalic acid solution 
with ammonia, then mixing it with sulphate of magnesia, evaporating the solution to 
dryness, and washing the insoluble oxalate of magnesia with a sufficient quantity of 
water, 
