In De minerarum docimasia humida (1780)

 In De minerarum docimasia humida (1780)


Back in De minerarum docimasia humida (1780) Bergman explained his processes for quantitative and qualitative evaluation of nutritional supplements by wet procedures. Reagents were used for qualitative evaluation, as in the case of mineral waters, except for qualitative investigation that he introduced a totally new process that shortly was generally embraced. Formerly it was customary to try to isolate the material being estimated (metal, ground, etc ) from the pure country, but Bergman precipitated it within an alkaline chemical of known composition, which had been filtered through a formerly weighed paper after which weighed after drying in the temperature of boiling water. It had been necessary to make certain the precipitate wasn't contaminated.


The method depended upon the innocence and insolubility of precipitates of famous composition. Bergman discussed these variables in a third treatise. Other chemists, especially R. Kirwan and C. F. Wenzel, acquired different results, but Bergman's prestige induced his characters to be generally accepted for several decades. Back in 1789 L. B. Guyton de Morveau demonstrated that Bergman's outcomes were inconsistent, and the majority of them were left (as were Kirwan's and Wenzel's), but his newest analytic approaches were of permanent price.


In De praecipitatis metallicis Bergman also believed the phenomena detected when metals dissolved in acids, also, as in other writings , he accepted the opinion that phlogiston was dropped from the metal. He embraced the phlogistic justification of combustion and calcination Proposed by C. W. Scheele: phlogiston in the combustible or alloy along with"fire air" (oxygen) to form warmth, a subtle substance that escaped throughout the boat. Bergman did, however, create a significant first contribution to the phlogiston theory in 1782, when he tried to gauge the comparative amounts of phlogiston in various metals by deciding the weight of a single metal which could precipitate another out of alternative. Therefore, from alternative in nitric oxide , 100 parts of silver have been precipitated by 135 of germ, 234 of direct, 31 of aluminum, etc; and those weights have been believed to contain exactly the identical quantity of phlogiston, for its response included just its own transfer. There were inconsistencies as a result of these consequences as incomplete precipitation along with the occasional growth of hydrogen, also it might be reading too much into those results to state that Bergman had grasped the notion of equivalents. This task is, nevertheless, significant as one of the very few efforts made to set the phlogiston theory on a qualitative basis.

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