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killswitch
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An easier way to get concentrated hydrogen peroxide is to simply freeze store-bought peroxide, crush it, freeze it again, pack the crushed ice in a
funnel, and collect the first 10% or so and discard the rest.
50/50 peroxide/water freezes at -52 Celsius. The closer the temperature to this point, the higher the concentration of peroxide (to a maximum of 50%)
in the liquid. Of course, with 3% peroxide, you'll basically get a slightly moist chunk of water ice if you leave the bottle in the freezer, even if
you don't go much below 0ºC. Hence the crushing/refreezing step mentioned above.
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subsecret
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Why is the melting point of an H2O2 mixture lower than the melting point of pure H2O2? Wikipedia says that
the melting point of pure hydrogen peroxide is -0.42 degrees Celsius.
Crushing it is definitely important, I've seen people just freeze the entire OTC bottle of hydrogen peroxide.
[Edited on 20-8-2013 by Awesomeness]
Fear is what you get when caution wasn't enough.
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Rosco Bodine
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http://en.wikipedia.org/wiki/Colligative_property
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subsecret
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Very interesting, thank you.
Fear is what you get when caution wasn't enough.
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