QUESTIONS ABOUT :

Hirsch Funnel

What is a Hirsch Funnel and how are they used?

They are used for vacuum filtration to separate crystals, or solids, from a liquid. Usually a neoprene adapter is used to fit the funnel to a flask that is attached to some sort of...
http://wiki.answers.com/Q/What_is_a_Hirsch_Funnel_...

What is the difference between Hirsch funnel and Buchner funnel?

Hirsch funnels are essentially smaller buchner funnels and meant for filtering smaller amounts.
http://wiki.answers.com/Q/What_is_the_difference_b...

Why Hirsch and buchner funnels should not be used for filtration of hot solutions?

Because more solute will be dissolved in the hot solution than a cold solution, so you will lose solute if the solution is hot.
http://wiki.answers.com/Q/Why+should+Buchner+or+Hi...

what would happen if a hot saturated solution were filtered by vacuum filtration using a hirsch funnel?

precipitation.
http://answers.yahoo.com/question/index?qid=200909...

when a chemical is purified (via vacuum filtration with a hirsch funnel, i think), does the melting point go up or down?

The melting point increases. Impurities cause the melting point of an otherwise pure substance to decrease.
http://answers.yahoo.com/question/index?qid=201302...

Useful sites about:

Hirsch Funnel

Büchner funnel - Wikipedia, the free encyclopedia

On top of the funnel-shaped part there is a cylinder with a perforated plate separating it from the funnel. The Hirsch funnel has a similar design; it is used similarly ...

en.wikipedia.org

Classic Kit: Hirsch's funnel - Royal Society of Chemistry

Hirsch's funnel. For the synthetic chemist, little can match the moment when one spies the telltale glint of a crop of crystals at the bottom of a flask. It is like a ray of ...

www.rsc.org

Vacuum filtration

8 Aug 2007 ... Figure 1 shows a setup for a vacuum (or suction) filtration using a Hirsch funnel. A vacuum filtration is usually faster than a simple gravity ...