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Hydrometer
Does anyone know where I can purchase a hydrometer to measure the volume of peroxide ? I have searched the Internet and have not been successful. Thank you
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6 Replies
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? Amazon came up with >2000 results
However if you want to measure it precisely (for QC) you need to titrate -
Do you mean measure the volumetric concentration of H2O2? It occurs to me that you could boil say 250 grams of it in a reflux setup (Vertically mounted Liebig condenser) to remove the excess oxygen. What remains is H2O. Then weigh the remaining water, and do the Math. I’m not absolutely sure that boiling will remove all of the extra oxygen, I’d have to check.
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I am looking for a device to drop into h202 to use when breaking down from 100 volume to say 20. I had one in the 80’s. The only ones I have seen are for wine and alcohol preparation.
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With some thought and glass tubing it might be possible to design one. An old geezer called Archimedes is relevant. It’s physics.
Please disregard my idea about boiling off the oxygen (unless you are doing it in the open air) because filling your lab with oxygen is not a good idea. -
If you are using pure H2O2 solutions, any hydrometer that measures the specific gravity of a liquid can be used and then you can convert the SG to concentration.
http://h2o2.evonik.com/product/h2o2/en/about-hydrogen-peroxide/basic-information/calculations/pages/calculate.aspxYou can get hydrometers from any lab supplies store. Just get one that matches the range of SG values that you will need.
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@David is correct: if you want an accurate result, the best method is titrating it with potassium permanganate
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