NurdRage has published a couple videos on oleum synthesis:

• Lab Notes - Making Oleum - Successful - (April 21-2024)
• Lab notes - Making Oleum - 20% yield improvement - (May 4th - 2024)

Still optimizations to be done, but cool work so far. I love that one of the OG chemistry YouTubers is still doing interesting work.

A long-time viewer of Periodic Videos grew up to study chemistry, and invented a new synthetic route for thalidomide.

Also, TIL that thalidomide still has several medical uses, as long as the recipients are not pregnant.

Cody Reeder makes thermite and has a nice "campfire".

The manual for my dishwasher says to refill salt just before running a wash cycle, because if any grains of salt spill onto the stainless steel interior it will corrode. If it runs right away, no issue because the salt is quickly dissolved, diluted, and flushed.

So then I realized when I cook pasta I heavily salt the water (following the advice that pasta water should taste as salty as the ocean). But what happens when I leave that highly salty brine in a pot, sometimes for a couple days to reuse it? Does that risk corroding the pots?

If you don't want to watch the entire video, it's a Carborane acid.

I'd love to see what the molecular orbitals look like. It's not every day that you see carbon forming six "bonds".

cross-posted from: https://lemmy.dbzer0.com/post/12359577

There are a few youtube videos where someone suggests using sulfuric acid to clean a secondary plate-style heat exchanger (for example). Yet I’ve heard sulfuric acid is extremely corrosive to metal, so something seems off about that advice. I certainly would not want an internal leak to cause radiator fluid to enter the tap water. I saw a drop of sulfuric acid land on a galvanized steel pipe once and within minutes it was rusted on the spot.

This guy also says sulfuric acid is an option but also says there is a safer alternative acid -- yet he did not mention what it is! Does anyone know?

This guy says he uses an ultrasonic bath but he does not say what chemicals he uses. Would distilled white vinegar be good for this?

Note these questions are very loosely related to this thread which describes a problem I am having, but really it’s a separate discussion. Secondary exchangers need periodic maintenance regardless of whether this is my current problem. I saved my previously clogged heat exchanger from a few years ago so I could work on cleaning it. I have a quite small ultrasonic I could try, but I cannot submerge the whole exchanger. I would have to stand it on end and only clean a few centimeters deep.

cross-posted from: https://lemmy.dbzer0.com/post/10839711

A top-floor room that’s not currently used has mold from excessive dampness. For a month I have been running a dehumidifier as it’s too cold to open the window.

Is this a good idea?

My concern: I heard about running a dehumidifier long-term in a damp basement is a bad idea because making the air more dry than the wall causes moisture to continuously flow from the outside in. That flow supposedly has the effect of washing the masonry through the capillaries and causing it to break down and weaken. In my case it’s not a basement, but similar because the exterior wall is non-stop wet from the frequent rains (possibly even leaky.. i think water seeps in).

I have the humidity set to 55%. I wonder if there is an optimum setting that would inhibit mold without overly causing water to flow through the wall (which is very old brick+mortar and rendered over on both sides, no insulation).

BTW, the water collected in the dehumidifier looks clean. Is it good for drinking?