On Topic: storage of 30% vinegar?

On 02 May 2025, T snipped-for-privacy@invalid.invalid posted some news:vv46l0$1k2ug$ snipped-for-privacy@dont-email.me:

Assuming you're asking about apple cider vinegar?

Keep it out of sunlight in a cool dry place say 80°F or less and it will be good for a couple years easy. It's very high in acid and self- preserving. You may see some sediment over time, that won't hurt anything. Basements or pantries are usually the best places. Glass bottles with metal caps may rust out over a long time.

No. 30% vinegar is weed killer.

I do not know what 30% vinegar (weed killer) is made up of. My wife is worried that storing it too hot will cause a fire or an explosion.

Apple cider vinegar is 5%. My weeds adore 5% white vinegar. 30% messes them up pretty good. One shot kill on dandelions. Takes two treatments on

Thank you anyway.

It is 30% acetic acid. It will not explode and fire hazard, it catching fire, is minimal. My garage gets hot in the summer and can dip below freezing in the winter so I would probably store it in the basement.

Thank you!

Any idea what temperature fire occurs at?

Presumably you don't also have strong oxidants in the shed.

I thought that it doesn't burn, but I asked chatgpt:

Yes, acetic acid can catch fire. It's a flammable liquid, especially in its glacial (concentrated) form.

Here are some key points:

Flash Point: Around 39–43 °C (102–109 °F) for glacial acetic acid — this is the temperature at which it can produce enough vapor to ignite in air.

Autoignition Temperature: Around 427 °C (800 °F) — the temperature at which it can ignite without a flame or spark.

Flammability Limits in Air: Typically 4–19.9% by volume.

So, while it's not as volatile as something like gasoline, concentrated acetic acid is still hazardous and should be stored and handled away from heat sources and open flames.

Are you working with it in a lab or another setting? ···················++-

The gallon jobs are sealed and capped. Does that make a difference.

Storing it up to go kill weeds. Should be used in about a month.

Is 30% considered "glacial"?

Thank you!

Do you have a link to the above?

Ask him, not me.

No, but you can ask chatgpt the same question.

Usually AI's will give a reference as to where they gathered they information. What question did you ask it so I can reproduce it?

AI's are often wrong too.

This is of pure 100% acetic acid. Not acetic acid mixed with water

Of 100% or 30%?

AI's can really bugger things up.

The question is posted above. Common, I copy pasted the entire thing, but the html links and the formatting was lost. It is enclosed in copy paste mark lines:

Very often safety and flammability warnings are not given for the specific mixture but for the pure ingredients. I have written many safety data sheets like this and err on the side of caution.

I did not realize that the question was your question an not a comment by the AI.

My chat search gave:

And I could not find any references, which mean its response is not to be trusted.

I tried the same search with search.brave.com's AI and got an unusable answer. But Brave's AI does give references. But none were really useful.

So far, the BEST source has been Frank.

And when I asked for links to its references to the prior Chat crashed. Chuckle.

Glacial, technically is 100%. Practically anything over about 90% could be considered glacial ,I suppose.

I never dealt with 30% acetic acid but used 100% in the lab along with acetic anhydride. I recall running reactions in it using acetic anhydride and 90% hydrogen peroxide to prepare epoxides. Fun days.