the Carinthian Molybdate of Lead. 325 
I did not find that the precipitate which subsided was soluble 
in cold water, as Scheele has mentioned.* 
The solution did not precipitate lime from nitric acid. 
C. Ten grains of the yellow molybdic acid were dissolved 
when digested with an ounce of concentrated sulphuric acid. 
The solution as it cooled became blue.-f 
Prussiate of pot-ash produced a reddish-brown precipitate. 
Muriate of tin had not any effect. 
When a portion of the solution was distilled to dryness, the 
yellow molybdic acid was left in its original state. J 
The remainder of the solution was saturated with lixivium 
of soda, by which the blue colour was heightened, and some 
white flocculent matter was precipitated. 
Prussiate of pot-ash added to part of this saturated solution 
did not precipitate the molybdacna, until the alkali was again 
supersaturated with an acid. 
Muriate of tin poured into the solution saturated with alkali 
changed it to a deep blue ; but when the alkali was again 
saturated with an acid the muriate of tin ceased to have any 
effect. 
The white flocculent matter which was precipitated when 
# Essays, p. 234. — Scheele does not mention the quantity of water which he 
employed. 
f Scheele observes that sulphuric acid dissolves a considerable quantity of mo- 
lybdic acid, and that the solution as it cools becomes blue and thick; but when 
heated, the colour, disappears, and returns again as the liquor grows cold. Essays, 
P- 235* 
% M. Pelletier says, that a small portion of molybdsena is raised by sulphuric 
acid when distilled with it ; but I did not find it so with the molybdic acid.— Mem, 
sur la Molybdene, Journ. de Physique, Decembrc, 1785. 
