Volume 5

Elements of natural history, and of chemistry / being the second edition of the ... lectures ... first published in 1782 ... translated into English with occasional notes, and an historical preface by the translator [W. Nicholson].

  • Fourcroy, Antoine-François de, comte, 1755-1809
Date:
1788-1789
Catalogue details

Licence: Public Domain Mark

Credit: Elements of natural history, and of chemistry / being the second edition of the ... lectures ... first published in 1782 ... translated into English with occasional notes, and an historical preface by the translator [W. Nicholson]. Source: Wellcome Collection.

    117/408 (page 103)
    niolybdic acitl of a portion of oxigene, and that a portion of. this acid paffes to the ftate of molybcjena. The molybdic acid, by the affiftance of heat, decompofes the alkaline nitrates and muriates, by difengaging theii\ acids, and forms \vitli their bafes neutral h\ks, whofe properties Scheele did not examine. This acid likewiie difengdges the carbonic acid from the three alkalis, and forms neutral falts with their bafes. Though Scheele has not made us acquaint- ed with all the properties of the neutral falts which we defign by the names of molybdates of potafh, of foda, of ammoniac, &c. he has neverthelefs pointed out three, which are fuf- iicient to charafterize their ftate of neutraliza- tion. He has difcovered, i. That fixed alkali readers the acid earth of molybdena more fo- ' iuble in water. 2. That this fait prevents the acid of molybdena from volatilization by heat. 3. That the molybdate of potafti falls down by cooling in Imall cryftalline grains, and that it may likev/ife be feparatcd from this folvent by the fulphuric and muriatic acids. The acid of molybdena decompofes the ba- rytic nitrate and muriate. The barytic mo- lybdate, formed in thefe operations, is foluble in water. The acid of molybdena appears partly to decompole the fulphatc of potafti, or vitriolated H 4 tartar,