[ 49 3 



tryfials fall into powder, it is very foluble in wa- 

 ter. This is found in abundance in fea-water, 

 and many mineral waters. It is detected by 



a. A Solution of muriated ponderous * earth 

 being added 10 water containing this {alt, a pre- 

 cipitate, in the form of white clouds will immedi- 

 ately appear, and white precipitate will be gra- 

 dually depofited. The ponderous earth leaving 

 the marine acid, will unite with the vitriolic, and 

 form ponderous fpar, which being infoluble in 

 water, gives this appearance when precipitated 

 from it, of a white foft cloud, peculiar to itfelf : 

 The marine acid combining with the natron, 

 forms marine fait, which remains diffolved in 

 the water. 



b. A folution of nitre of filver t being add- 

 ed, the water firft becomes of an opal or milky 

 hue, and after fome time acquires a redifli caft, 

 depofiting at length a fediment of that colour. 

 Here the vitriolic acid combines with the fil- 

 ver, forming fulphate of lilver, a fubftance al- 

 moft infoluble in water, therefore precipitated ; 

 The nitrous acid, combining with the natron, 

 forms cubic nitre, which remains diffolved in 

 the water. 



c. A folution of lead combined with the 

 acetous acid being added, a white percipitate 

 will immediately be formed. The lead com^ 

 bines with the vitriolic acid, forming a fub- 

 ftance infoluble in water, while the acetous 



# Ponderous earth combined with marine acid, 

 f Silver combined with nitrous acid. 



H acid> 



