2006-09-26 00:52:06 · 12 answers · asked by ÅñÑã 1 in Science & Mathematics ➔ Chemistry
Sublimation is probably the worst separation technique out there.
Just add water. The KBr will go into solution, the naphthalene will not. Filter off the naphthalene. Allow the water in the KBr solution to evaporate, and you have now separated the naphthalene and KBr...
2006-10-03 00:57:48 · answer #1 · answered by The ~Muffin~ Man 6 · 0⤊ 0⤋
simple.
in a watch glass or in a plate, place ur napthalene and potassium bromide. now place a glass funnel ( in such a way the tube is upside) to cover the substance. cover the tube with a cotton(to prevent the escape of napthalene) now u heat the mixture over a cantle or a burner. Naphthalene becomes vapourized and starts to go upward, where it reaches comparably cold area and deposits as a white powderin the funnel.
at the bottom u have KBr.
at the top (in the funnel) u have naphthalene.
2006-09-26 08:08:28 · answer #2 · answered by King pandia 2 · 0⤊ 0⤋
by finding the sublimation point of napthalene and the boiling point of the potassium bromide, you coud put the mixture into a distillation chamber (basically a pressure vessel with a cooling tube leading to a second chamber which is supercooled (ice bath) to create a mild suction). Heat the pressure vessel to a controlled temperature between the two temperatures and the napthalene will sublime and pass into the second chamber where it will be trapped, cooled, and return to its liquid state.
2006-09-26 08:06:45 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Add to a mixture of ether and water, shake, allow the two layers to separate then particition using a separating funnel. Lower layer will be water and will contain the potassium bromide (evaporate to dryness to isolate), the upper layer will contain the naphthalene, again evaporate to isolate.
In general sublimation is not suitable for purification of large amounts of material but you can get equipment from most suppliers eg http://www.sigmaaldrich.com/Area_of_Interest/Equipment_Supplies__Books/Glassware_Catalog/Sublimation.html
2006-10-04 07:53:50 · answer #4 · answered by drcjs_007 3 · 0⤊ 0⤋
Gently heat the mixture and collect the vapors. The vapors will be the napthalene. You can use a distillation column for this process. The stuff remaining in the heated container will be your KBr.
2006-09-26 08:04:37 · answer #5 · answered by metatron 4 · 0⤊ 0⤋
Sublimation is not an easy separation method.
Naphthalene is organic covalent ;KBr is inorganic ionic.
Add water KBr dissolves filter off the Naphthalene which is not water soluble.
OR add benzene naphthalene dissolves KBr does not.
2006-09-26 08:44:28 · answer #6 · answered by deflagrated 4 · 1⤊ 0⤋
You almost answered the question yourself. Warm the mixture. Naphthalene will sublime. You can condense it on a cold surface.
2006-10-01 03:31:15 · answer #7 · answered by yupchagee 7 · 0⤊ 0⤋
Easily, by just adding water. The KBr will dissolve in water while naphthalene will not.
2006-10-04 03:01:37 · answer #8 · answered by Aldo 5 · 0⤊ 0⤋
How did you end up with such a mixture? Stop playing around with your big bro's young chemist set.
2006-09-26 10:38:57 · answer #9 · answered by jarynth2 2 · 0⤊ 1⤋
Easiest method by using a color seperation device.
2006-10-04 03:06:31 · answer #10 · answered by Kayem 1 · 0⤊ 0⤋