The Chemistry And Technology of Paints
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5 g. Of the sample, boil gently for about ten minutes and allow to stand for several hours. Dilute with hot water, filter and wash until the filtrate is about 200 c. C.
Render the filtrate slightly acid with hydrochloric, boil to expel carbon dioxid and precipitate the sulphate with a slight excess of barium chloride solution.
Filter, wash and weigh as BaSO 4 . Calculate the lat- ter to PbSO 4 .
ZINC OXID Insoluble. Dissolve i g. In hot dilute acetic~licid. Filter, wash and weigh any insoluble ...residue. If the latter is very small in quantity, it should be deter- mined by dissolving a proportionately larger quantity of zinc oxid.
Zinc. Neutralize the filtrate with ammonia, then make faintly acid with acetic acid, dilute to 300 c. C. , and precipitate with sulphuretted hydrogen. The solution should be kept hot during the precipitation, and should smell strongly of hydrogen sulphide at the end. Allow the precipitate to settle, decant through an alundum or Gooch crucible, keeping the crucible full of liquid during the filtration, wash the precipitate in the beaker with a 294 CHEMISTRY AND TECHNOLOGY OF PAINTS hot 2 per cent acetic acid solution saturated with hydro- gen sulphide, finally transferring the zinc sulphide to the crucible and allowing the last wash water to drain com- pletely.
What to read after The Chemistry And Technology of Paints?
You can find similar books in the "Read Also" column, or choose other free books by Maximilian Toch to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
5 g. Of the sample, boil gently for about ten minutes and allow to stand for several hours. Dilute with hot water, filter and wash until the filtrate is about 200 c. C.
Render the filtrate slightly acid with hydrochloric, boil to expel carbon dioxid and precipitate the sulphate with a slight excess of barium chloride solution.
Filter, wash and weigh as BaSO 4 . Calculate the lat- ter to PbSO 4 .
ZINC OXID Insoluble. Dissolve i g. In hot dilute acetic~licid. Filter, wash and weigh any insoluble ...residue. If the latter is very small in quantity, it should be deter- mined by dissolving a proportionately larger quantity of zinc oxid.
Zinc. Neutralize the filtrate with ammonia, then make faintly acid with acetic acid, dilute to 300 c. C. , and precipitate with sulphuretted hydrogen. The solution should be kept hot during the precipitation, and should smell strongly of hydrogen sulphide at the end. Allow the precipitate to settle, decant through an alundum or Gooch crucible, keeping the crucible full of liquid during the filtration, wash the precipitate in the beaker with a 294 CHEMISTRY AND TECHNOLOGY OF PAINTS hot 2 per cent acetic acid solution saturated with hydro- gen sulphide, finally transferring the zinc sulphide to the crucible and allowing the last wash water to drain com- pletely.
What to read after The Chemistry And Technology of Paints?
You can find similar books in the "Read Also" column, or choose other free books by Maximilian Toch to read onlineMoreLess
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