Chemical And Pharmaceutical Manipulations a Manual of the Mechanical And Chemic
Chemical And Pharmaceutical Manipulations a Manual of the Mechanical And Chemic
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The dried filter and contents are then to be transferred to the crucible, which must be previously weighed. The transfer must be made without the loss of the least particle, and for this purpose the crucible may be placed upon a sheet of glazed white paper, so that any particles that accidentally fall in the act of emptying the filter may be preserved. The filter, after having been freed as much as possible from the adherent 288 IGNITION OF FILTERS.
precipitate by gently rubbing the sides toget...her between the thumb and forefinger, is finally placed in the crucible with its contents being folded loosely and laid at the top. The force used for this purpose must not be sufficient to abrade the paper, other- wise the matter will reach the fingers, and a loss thus be occa- sioned by adherence. The crucible is then heated cautiously and gradually over the spirit or gas lamp, Fig. 141, the flame of which may be urged by the blast. For the first few moments the vessel should remain covered, for fear of loss by decrepitation, but as soon as it becomes red hot the lid may be wholly or partially removed, and the crucible inclined, as at Fig.
What to read after Chemical And Pharmaceutical Manipulations a Manual of the Mechanical And Chemic?
You can find similar books in the "Read Also" column, or choose other free books by Campbell Morfit to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The dried filter and contents are then to be transferred to the crucible, which must be previously weighed. The transfer must be made without the loss of the least particle, and for this purpose the crucible may be placed upon a sheet of glazed white paper, so that any particles that accidentally fall in the act of emptying the filter may be preserved. The filter, after having been freed as much as possible from the adherent 288 IGNITION OF FILTERS.
precipitate by gently rubbing the sides toget...her between the thumb and forefinger, is finally placed in the crucible with its contents being folded loosely and laid at the top. The force used for this purpose must not be sufficient to abrade the paper, other- wise the matter will reach the fingers, and a loss thus be occa- sioned by adherence. The crucible is then heated cautiously and gradually over the spirit or gas lamp, Fig. 141, the flame of which may be urged by the blast. For the first few moments the vessel should remain covered, for fear of loss by decrepitation, but as soon as it becomes red hot the lid may be wholly or partially removed, and the crucible inclined, as at Fig.
What to read after Chemical And Pharmaceutical Manipulations a Manual of the Mechanical And Chemic?
You can find similar books in the "Read Also" column, or choose other free books by Campbell Morfit to read onlineMoreLess
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