An analysis of the Carinthian molybdate of lead ... : To which are added some experiments and observations on the decomposition of the sulphate of ammoniac / [Charles Hatchett].

  • Hatchett, Charles, 1765?-1847
Date:
[1796]
Catalogue details

Licence: Public Domain Mark

Credit: An analysis of the Carinthian molybdate of lead ... : To which are added some experiments and observations on the decomposition of the sulphate of ammoniac / [Charles Hatchett]. Source: Wellcome Collection.

    12/58 (page 10)
    § iv. As Mr. Klaproth had proved the action of the fixed al¬ kalies on the molybdate of lead, in the dry way, I was de¬ sirous to know what effects they would produce in the humid way, and therefore made the following experiments. EXPERIMENT I. A. I boiled four ounces of strong lixivium of caustic pot¬ ash with twenty grains of the purified ore, till there remained at the bottom of the matrass a dry mass, which was partly red, yellow, and green. I reduced this to powder, and poured distilled water on it, till the water came away without any taste. Tire alkaline solution was filtrated, and afterwards satu¬ rated with sulphuric acid. The liquor then became turbid, and deposited a small quantity of a white precipitate, which con¬ sisted of lead and some molybdic acid. This was separated by a filter, and prussiate of pot-ash being added to the clear liquor, precipitated a great quantity of molybdcena, in the state of a reddish-brown flocculent precipitate. B. I took the residuum of the alkaline solution (which now was chiefly of a red colour, and appeared like minium) and poured nitric acid, very largely diluted, on it till the whole was dissolved. I then precipitated the lead with sulphuric acid, and from the clear liquor which remained I afterwards, by the means of prussiate of pot-ash, obtained a quantity of Prussian blue.