This preview shows page 1. Sign up to view the full content.
Unformatted text preview: few degrees. The Tabloid or Pellet Press. When determining the molecular weight of a solid substance in solution, it is often most convenient to add a weighed pellet or tabloid of the substance to the solvent. A tabloid press is therefore used to compress the powdered substance into a pellet of suitable weight. The press consists essentially of a cylinder C (Fig. 78), having a circular bore through its long axis. The cylinder C fits over a metal base B, and a plunger P fits closely into the circular bore: the plunger P and the cylinder C have side-arms to limit rotation in the frame F. FIG. 78. In use, the cylinder C is fitted over the base B, and the powdered compound is placed in C in small quantities at a time, and pressed firmly down (by hand) with the plunger P. When sufficient material has been placed in C, the whole unit is fitted into the frame F as shown, and the screw-plunger S screwed down...
View Full Document
- Fall '06
- Organic chemistry