the Attractive Powers of Mineral Acids. 29 
270" at leaft. By pouring warm water on the dephlogidicated 
mafs a folution is obtained. 
The calces of cobalt are drill more foluble ; even a dilute 
acid will ferve. 
Cobalt in nitrous acid. 
100 grs. of cobalt requires 220 grs. of real nitrous acid, 
whofe proportion to water is as 1 to 4, giving towards the end 
a heat of i Bo°. 
The calces of cobalt are foluble in this acid. 
Cobalt in marine acid. 
100 grs. of fpirit of fait, whofe fpecihc gravity is 1,17$, 
difl'olves, with the abidance of heat, 2| grs. of cobalt. A 
more concentrated acid will dilfolve more. 
The calces of cobalt are more ioluble in this acid, 
Regulus of antimony in vitriolic acid. 
100 grs. of regulus of antimony require for their folution 
725 grs. of real acid, whofe proportion to water is as 1 to 4. , 
and a heat of 400°. More regulus fhould be employed than is 
expe&ed to be didolved, and the rel'ulting fait requires a large 
quantity of water to diflolve it ; for the concentrated acid lets 
fall much when water is added to it. A lefs concentrated acid 
will alfo diflolve this femi- metal, but in fmaller quantity. 
The calces of antimony, even diaphoretic antimony, are 
fomething more foluble. 
Regulus of antimony in nitrous acid. 
0 # 
100 grs. of this femi-metal require 900 grs. of real nitrous 
acid, whofe proportion to water is as 1 to 12, aided with a 
heat* 
