410 
Book II. 
Division II. 
SALTS. 
This salt is also capable of combining with an excess 
of acid, and forming a super-oxalat sparingly soluble in 
water ; but the properties of this triple salt have not 
been much examined. 
Sp. 8. Oxalat of Ammonia. 
WHEN oxalic acid is saturated with ammonia, the 
solution yields by evaporation oxalat of ammonia cry 
stallized in four-sided prisms, terminated by dihedral 
summits. They are soluble in water, but insoluble in 
alcohol. When distilled, carbonat of ammonia is dis 
engaged, a little of the salt is sublimed, and a residuum 
of charcoal remains behind. This salt is much used as 
a reactive to detect the presence of lime *. 
It is capable of combining with an excess of acid, and 
forming a super-oxalat. 
Sp. 9. Oxalat of Alumina. 
OxALIc acid readily dissolves alumina, and forms a 
salt which is uncrystallizable ; but furnishes on evapora 
tion a yellowish pellucid mass. It is sparingly soluble 
in alcohol. It has a sweet astringent taste. It is com 
posed of . . . . . . . . 44 alumina 
56 acid and water 
100 
WHEN exposed to the air it deliquesces; and if it has 
been previously well dried, its weight is increased by 3. 
It reddens turnsole t. 
Ibid. il. 387. 
* Bergman, i. 261.