This preview shows page 1. Sign up to view the full content.
Unformatted text preview: for filtering hot solutions. A satisfactory form of the apparatus is shown in Fig. 6, in which the double-walled funnel is heated by blowing steam through the apparatus as shown. A glass filter funnel of the usual type fits snugly into the hot-water funnel. This type has the advantage that, during the fil-tration of a hot inflammable liquid, the steam generator (and therefore the heating appar-atus) can be removed to a safe distance. It should be noted that the inner glass funnel should have a stem so short that it projects only just below the outer metal funnel. If the stem is longer it serves merely to cool the filtered solution, which may then crystallise and com-pletely stop the filtration. For the filtration of small quantities of dilute solution, it is often possible to dispense with the outer heater, and use the ordinary glass funnel which has been heated above a flame immediately before use. Steam FIG. 6....
View Full Document
This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.
- Fall '06
- Organic chemistry