the Attra&ive Powers of Mineral Acids. 27 
be ufed, lefs will be diffolved, as much of the acid will efcape 
during the efFervefcence. 1 could procure no nitrous air from 
the folution by any management, as the nitrous acid is in part 
decompofed during the operation. 
The calces of zinc, if not too much dephlogidicated, are 
alfo foluble in this acid. 
» ‘ * 
Zinc in Marine Acid. 
The fame quantity of zinc requires of this acid atogr*. 
the proportion of real acid in the menftruum being as 1 to 9, 
and ufing from time to time a (light heat. If a lefs dilute acid 
be ufed, more real acid will be requifite, as much of it will 
efcape during the efFervefcence. 
The calces of zinc are alfo foluble in this acid. 
Bifmuth in vitriolic acid, . 
200 grs. of oil of vitriol, whofe fpecific gravity was 1,863, 
diffolved but three grs. of wifmuth in a ftrong heat ; but 
(lightly dephlogifticated a greater quantity. 400 grs. of fpirit 
of vitriol, whofe fpecific gravity was 1,200, diffolved but one 
grain. The calces of wifmuth are much more foluble. The 
lolution of the 3 grs. afforded 4 cubic inches of vitriolic air. 
Bifmuth in nitrous acid. 
The folution of 100 grs. of bifmuth require but 100 grs. of 
real nitrous acid, whofe proportion to water (hould be as 1 to 
8 or y. In this lad cafe, a gentle heat may be applied. This 
folution affords 44 cubic inches of nitrous air. The calces of 
bifmuth are alfo foluble in this acid. 
E 2 
Bifmuth 
