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P. 380
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376
property of nitrogen, is evolved in small bubbles, and a
flocculent mass of the form of the piece immersed, is left.
Solution of potash, boiled for some time upon it, had but
little action ; the tartar became whiter, the solution yellow
upon the addition of nitric acid to the separated solution,
the colour nearly disappeared without any precipitate being
formed : ammonia reproduced the yellow colour.
The flocculent substance left by dilute nitric acid, after
washing off the acid, being boiled with solution of potash,
was not wholly dissolved ; the solution became yellow. Nit-
ric acid being added, discharged the colour, which ammonia
reproduced.
Water, boiled for some time upon tartar, gave no precipi-
tate or turbid appearance on the addition of solution of tan-
nin.
Tartar exposed to a red heat, in a silver crucible, smokes,
accompanied with a greasy smell ; is blackened in a similar
manner to bone, and becomes more easily soluble in nitric
acid, leaving a carbonaceous residuum.
The solutions of potash which have been boiled on tartar
being neutralized with nitric acid, gave no precipitate with
solution of nitrate of barytes.
Analysis.
Fifty grains of tartar of the teeth were placed in 400
grains of nitric acid 1.12 ; nitrogen gas was slightly libera-
ted : in twenty-four hours it was diluted with two ounces of
distilled waters, and then filtered.
The solution was then precipitated by ammonia, and fil-
tered ; and, upon the addition of carbonate of ammonia, re-
mained, clear, the precipitate produced, being dried at 212°,
weighed 40 grains, and, when ignited, it weighed 35, which
376
property of nitrogen, is evolved in small bubbles, and a
flocculent mass of the form of the piece immersed, is left.
Solution of potash, boiled for some time upon it, had but
little action ; the tartar became whiter, the solution yellow
upon the addition of nitric acid to the separated solution,
the colour nearly disappeared without any precipitate being
formed : ammonia reproduced the yellow colour.
The flocculent substance left by dilute nitric acid, after
washing off the acid, being boiled with solution of potash,
was not wholly dissolved ; the solution became yellow. Nit-
ric acid being added, discharged the colour, which ammonia
reproduced.
Water, boiled for some time upon tartar, gave no precipi-
tate or turbid appearance on the addition of solution of tan-
nin.
Tartar exposed to a red heat, in a silver crucible, smokes,
accompanied with a greasy smell ; is blackened in a similar
manner to bone, and becomes more easily soluble in nitric
acid, leaving a carbonaceous residuum.
The solutions of potash which have been boiled on tartar
being neutralized with nitric acid, gave no precipitate with
solution of nitrate of barytes.
Analysis.
Fifty grains of tartar of the teeth were placed in 400
grains of nitric acid 1.12 ; nitrogen gas was slightly libera-
ted : in twenty-four hours it was diluted with two ounces of
distilled waters, and then filtered.
The solution was then precipitated by ammonia, and fil-
tered ; and, upon the addition of carbonate of ammonia, re-
mained, clear, the precipitate produced, being dried at 212°,
weighed 40 grains, and, when ignited, it weighed 35, which
