How should I store my caustic potash (KOH) solution?

I had a 2N solution of KOH stored in a 2L plastic soda bottle. I went to use some today and the bottom the bottle had cracked and it leaked everywhere. I’ve heard you shouldn’t store it in glass. Anyone have suggestions for how I should store it?

Maybe its telling you that you shouldn’t store hazardous liquids in food bottles. :slight_smile:

Try HDPE (number 2 plastic) bottles. The ones you get for vinegar for example. That’s where I store caustic soda solutions.

Kai

Yeah I have some empty 1-gallon vinegar jugs I could use. I read somewhere you should use PET bottles to store a KOH solution. I’ve read elsewhere that PET provides good chemical resistance, so I’m surprised it was an issue.

I learned everything about storing caustic compounds from Breaking Bad. HDPE = you can dissolve a body in it.

I use 8N KOH for titrating calcium hardness in water.  I buy it already made up (mixing an 8N KOH solution is a highly exothermic process).  The KOH reagent bottles are made of HDPE.

I also use the 8N KOH for controlling pH in fermenting mead and sugar washes.

This sounds like a case of a little knowledge is a dangerous thing.  PET is a condensation polymer so it is susceptible to attack from highly basic solutions.

Luckily, my experience with bases dissolving containers ended a lot better than it did for Jesse.

IIRC that was hydrofluoric acid. Caustic is what you’d use to actually dissolve a body - and as a bonus, it wouldn’t have eaten through the bathtub!

Next you’ll tell me Bryan Cranston isn’t really a drug king-pin!

Shhhhhh! Spoilers! We’re only on the 6th episode of season one…

Oh man, I hate that! Sorry. I’m watching The Wire right now, and it’s pretty hard to avoid spoilers for a show that’s almost a decade old now.

Omar’s comin.

Indeed.

http://www.funnyordie.com/videos/414fa4b226/the-wire-the-musical-with-michael-kenneth-williams