maqce
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Chemical attack inside the flask
Hello,
I recieved new flasks and I had a problem : I can't boil liquids in it because the surface inside the flask is too smooth. I haven't any magnetic
stir, and even with boiling chips (broken glass) it still bumps violently. I scratched the botton of the flask but it's not efficient.
So I thought I could chemicaly attack the glass to create porosity. I have NaOH, I can reflux concentrated NaOH solution in the bottom of the flask.
Do you think it could work ?
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BromicAcid
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In my experience accidentally injuring a flask with NaOH I did not end up with a frosted inside but instead a very smooth bumpy inside. Are all your
issues bumping related to the same liquid/solution? Are you heating it too fast, applying vacuum too fast, or maybe not examining all the variables?
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maqce
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Quote: Originally posted by BromicAcid  | | Are all your issues bumping related to the same liquid/solution? Are you heating it too fast, applying vacuum too fast, or maybe not examining all
the variables? |
I already had this problem before, but today it happened when I was distilling ethanol, heating it very gently with boiling chips and scratched
bottom, and no vacuum. I don't know what it could be..
[Edited on 18-4-2020 by maqce]
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maqce
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The scratches helped a bit, but it still bumps
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DraconicAcid
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Broken glass for boiling chips? You want broken ceramic.
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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unionised
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The silica gell beads you get in little bags that say "do not eat" do a much better job as boiling chips than broken glass does.
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maqce
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| Quote: Originally posted by unionised | | The silica gell beads you get in little bags that say "do not eat" do a much better job as boiling chips than broken glass does.
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Oh that's smart ! Thx I'll try it
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mackolol
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And is it round bottom flask or the Erlenmeyer?, because Erlenmeyers always bump without vigorous stirring during distillation.
If it's Round bottom, you can add some acid washed sand, I used it in ether synthesis and worked just fine.
[Edited on 19-4-2020 by mackolol]
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