Laboratory Notes On Iron And Steel Analyses
Laboratory Notes On Iron And Steel Analyses
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Two grammes of the finely -powdered sample (dried at 110 C. ) are ignited at a full red heat in a muffle furnace.
The loss of weight x 50 = percentage of carbon dioxide.
ESTIMATION OF SILICA.
Two grammes of the powdered sample (dried at 110 C. ) are treated with a little pure hydrofluoric acid in a tared platinum crucible, evaporated to- dryness, in front of the muffle, arid, finally, ignited.
The loss in weight = SiO 2 + |C0 2, since the silica forms silicon tetrafluoride (SiF 4 ), which is vo...latilised, and the calcium carbonate (CaC0 3 ) present is con- verted into calcium fluoride (CaF 2 ) CaC0 3 + 2HF = CaF 2 + C0 2 + H 2 O.
100 ~78~ Whence 100 - 78 = 22, or half the molecular weight of C0 2 .
360 LABORATORY NOTES.
Therefore, subtract half the loss in weight in the carbon dioxide estimation from the loss in weight in this estimation. Then, as 2 grammes were taken for the estimation, the difference x 50 = percentage of silica.
EXAMPLE Loss on ignition of 2 grammes = 0*042 gramme. Loss on treatment of 2 grammes with hydrofluoric acid = 0*124 gramme.
What to read after Laboratory Notes On Iron And Steel Analyses?
You can find similar books in the "Read Also" column, or choose other free books by Macfarlane, Walter, D. 1767 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Two grammes of the finely -powdered sample (dried at 110 C. ) are ignited at a full red heat in a muffle furnace.
The loss of weight x 50 = percentage of carbon dioxide.
ESTIMATION OF SILICA.
Two grammes of the powdered sample (dried at 110 C. ) are treated with a little pure hydrofluoric acid in a tared platinum crucible, evaporated to- dryness, in front of the muffle, arid, finally, ignited.
The loss in weight = SiO 2 + |C0 2, since the silica forms silicon tetrafluoride (SiF 4 ), which is vo...latilised, and the calcium carbonate (CaC0 3 ) present is con- verted into calcium fluoride (CaF 2 ) CaC0 3 + 2HF = CaF 2 + C0 2 + H 2 O.
100 ~78~ Whence 100 - 78 = 22, or half the molecular weight of C0 2 .
360 LABORATORY NOTES.
Therefore, subtract half the loss in weight in the carbon dioxide estimation from the loss in weight in this estimation. Then, as 2 grammes were taken for the estimation, the difference x 50 = percentage of silica.
EXAMPLE Loss on ignition of 2 grammes = 0*042 gramme. Loss on treatment of 2 grammes with hydrofluoric acid = 0*124 gramme.
What to read after Laboratory Notes On Iron And Steel Analyses?
You can find similar books in the "Read Also" column, or choose other free books by Macfarlane, Walter, D. 1767 to read onlineMoreLess
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