The Vespiary

The Hive => Chemistry Discourse => Topic started by: FriendlyFinger on February 21, 2003, 06:24:00 PM

Title: Peroxides in Petroleum Spirits?
Post by: FriendlyFinger on February 21, 2003, 06:24:00 PM: Does Petroleum Spirits form explosive peroxides?

Swim used some 40¢X-60¢X ligroin a year ago to extract THC from green stuff and want's to use the same solvent again. After extraction, swim collects the spent powered material, rams it in a wide neck flask, puts it in a water bath and recovers the solvent untill dry.

If so, can you test the same way you would for Diethyl Ether.?
Does a Ferro-salt destroy the peroxide quickly?

Thanks,
FF
Title: Does Petroleum Spirits form explosive ...
Post by: raffike on February 22, 2003, 12:06:00 AM: Does Petroleum Spirits form explosive peroxides?
They don't form explosives even in the presence of H2O2,alkanes are pretty stable,they only burn when heated to some certain temperature.
Title: For a simple peroxide test soak filter paper...
Post by: Lilienthal on February 22, 2003, 02:08:00 AM: For a simple peroxide test soak filter paper stripes in KI / starch solution. Peroxides should give a purple-blueish spot due to the I₂ / starch inclusion complex. But only ethers (especially diethylether) form explosive peroxides on storage under light and oxygen.
Title: titration
Post by: GC_MS on February 23, 2003, 04:56:00 PM: For a simple peroxide test soak filter paper stripes in KI / starch solution. Peroxides should give a purple-blueish spot due to the I2 / starch inclusion complex. But only ethers (especially diethylether) form explosive peroxides on storage under light and oxygen.

Is this KI/starch solution turning purple the same as the iodometric titration they use to determine the concentration of peracids in a solution? I have read about "iodometric titrations" in a couple of peracid-related articles, but they never explain how exactly they performed the titration.
Title: Iodometry
Post by: lugh on February 23, 2003, 05:17:00 PM: is the technique in which an oxidant is treated with I^- to produce I₃^-, which is then tritrated, usually with thiosulfate :)