Principles of Quantitative Analysis An Introductory Course
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A very high temperature must be used to convert Mg(NH 4 )P0 4 into Mg 2 P 2 7, hence the precipitate should be ignited in a small crucible with a Meker or Chaddock burner, or over a blast lamp. At the temperature finally attained a slight sintering of the precipitate takes place, and if particles of unconsumed filter paper are still present they may be so surrounded as to prevent complete oxidation. Hence the temperature should be kept rather low until the combustible matter has been consumed. ...This difficulty can usually be avoided * Zeit. Fur anorganische Chemie, 20, 121 (1899).
MAGNESIUM IN MAGNESIUM SULFATE 157 by moistening the precipitate and filter with a few drops of a strong solution of ammonium nitrate before ignition.
Some chemists prefer to separate this precipitate on a Gooch crucible, but the large size of these crucibles increases the difficulty of bringing the precipitate to the proper temperature. Altho the precipitate is not readily reduced, it is not wise to ignite it in a platinum crucible as the latter becomes brittle and soon cracks if used repeatedly for this purpose; this is probably due to the forma- tion of a small amount of a phosphide of platinum.
What to read after Principles of Quantitative Analysis An Introductory Course?
You can find similar books in the "Read Also" column, or choose other free books by Walter Charles Blasdale to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
A very high temperature must be used to convert Mg(NH 4 )P0 4 into Mg 2 P 2 7, hence the precipitate should be ignited in a small crucible with a Meker or Chaddock burner, or over a blast lamp. At the temperature finally attained a slight sintering of the precipitate takes place, and if particles of unconsumed filter paper are still present they may be so surrounded as to prevent complete oxidation. Hence the temperature should be kept rather low until the combustible matter has been consumed. ...This difficulty can usually be avoided * Zeit. Fur anorganische Chemie, 20, 121 (1899).
MAGNESIUM IN MAGNESIUM SULFATE 157 by moistening the precipitate and filter with a few drops of a strong solution of ammonium nitrate before ignition.
Some chemists prefer to separate this precipitate on a Gooch crucible, but the large size of these crucibles increases the difficulty of bringing the precipitate to the proper temperature. Altho the precipitate is not readily reduced, it is not wise to ignite it in a platinum crucible as the latter becomes brittle and soon cracks if used repeatedly for this purpose; this is probably due to the forma- tion of a small amount of a phosphide of platinum.
What to read after Principles of Quantitative Analysis An Introductory Course?
You can find similar books in the "Read Also" column, or choose other free books by Walter Charles Blasdale to read onlineMoreLess
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