$26 Mr. Hatchett’s Analysis of 
the solution was saturated with soda, was edulcorated and 
heated with nitric acid, by which it was converted into a 
yellow powder, similar to the molybdic acid which had been 
dissolved. 
D. Ten grains of the yellow molybdic acid, when digested 
in a strong heat with one ounce of concentrated muriatic acid, 
formed a pale yellowish-green solution. 
Prussiate of pot-ash precipitated the molybdaena. 
Muriate of tin had not any effect. 
A portion of the solution being distilled to dryness, left a 
greyish-blue residuum.* 
I then saturated the remaining part of the solution with 
lixivium of pot-ash, by which the blue colour became more 
apparent, and a much larger quantity of white flocculent 
matter was precipitated than when soda was employed. 
Prussiate of pot-ash did not affect this solution, until the 
alkali was again saturated with an acid. 
Muriate of tin was precipitated by the solution saturated 
with alkali, highly coloured with blue ; but when the alkali 
was again saturated with an acid, the muriate of tin had not 
any effect. -f 
* Scheele has made the same observation. Essays, p. 235. 
f From the effects produced by muriate of tin on the molybdic acid dissolved in 
water, in acids, and in alkalies, it appears that it always tends to deprive the molyb- 
dic acid of a great part of its oxygen ; and when water is the menstruum, the muriate 
of tin does this effectually; but when the molybdic acid is dissolved in sulphuric or 
muriatic acid, the muriate of tin has not any effect, because (as I conceive) the 
oxygen is supplied by the acid menstruum. This seems the more evident from the 
effects produced by the muriate of tin when the excess of acid is saturated by an 
alkali. 
