Questions tagged [safety]

Questions regarding chemical and lab safety. This includes questions about proper lab procedure, safe chemical handling, and such.

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1answer
885 views

Will a Galileo's Thermometer containing liquid paraffin explode in my car if the temperature is above 35 degrees Celsius?

I'm driving from Sydney to Melbourne (approximately 12 hours trip) and I'm wondering if it's safe to have this Galileo's Thermometer in my car during the trip if it's going to be a scorcher of a day. ...
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1answer
2k views

Is there any substance that's a 0-0-0 on the NFPA diamond?

Is there any substance that's a 0-0-0 on the NFPA diamond? Basically a perfectly safe chemical.
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1answer
101 views

What are the properties of various solutions at pH <2 that may cause injuries?

For example, why do some solutions not cause any injuries at pH 2 while HCl does?
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1answer
162 views

Safety concerns for radical halogenations of methane in sunlight?

I wanted to know about the substitution reaction of alkanes particularly interested in the reaction of methane with fluorine and chlorine.
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0answers
1k views

Perfluorobutanesulfonic acid (PFBS) Safety and Toxicity

I was wondering if anyone had any experience with PFBS or PFOS (perflurooctane sulfonic acid)? I am thinking about trying to purchase some of these fluorosurfactants in bulk in order to (hopefully) ...
4
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1answer
13k views

How to store chloroform?

I'm going to be aliquoting out ethanol-stabilized chloroform into smaller containers. It's presently in a large bottle sealed with a rubber(y) sheet so I can only draw it out with a needle. My ...
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1answer
2k views

How to prevent petrol from being flammable?

Is there any way to prevent petrol from being flammable without losing it's solvent properties? Preferably some affordable way that is applicable for DIY. In my case, petrol is used for bearing ...
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2answers
4k views

How to quickly cool a test tube without cracking it?

Is there a way to safely cool a heated test tube quickly without cracking it due to sudden thermal stress in the glass? One thing that I tried was blowing on it, cooling it in slightly lukewarm water ...
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2answers
2k views

Why do pharmaceutical drugs have a expiration date?

Every now and then you reach into the bathroom cabinet to find that some pill or ointment you where planning to use has gone past its expiration date. I am interested whether this expiration date has ...
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1answer
2k views

Rotary Evaporator Cleaning

I am using a rotary evaporator ('rotovap') in my lab mainly with dichloromethane as a solvent. Usually between experiments I clean the receiving and boiling flasks with a brush using soap and water ...
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3answers
6k views

Is it dangerous to inhale the steam coming from electrolysis of salt-water solution [closed]

Is chlorine in there that accumulates (at the anode) and emerge out as chlorine gas? I was worried since I added a pinch of salt to the steamer in order to hasten the heating of tap water when I ...
8
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1answer
423 views

Consequences of using reagent preserved with sodium azide on gold film

I am running experiments using reagents preserved with 0.1% sodium azide, which are applied to a gold film. Unfortunately, there are very few options for using reagents without sodium azide. I ...
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2answers
147 views

“Drinking water” plastic - can I store beer in this?

This is an outdoors & chemistry question. I have an old and functional water bladder, shown below. On it, there are markings that coffee, beer, wine, hot drinks etc. must NOT be stored inside, ...
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1answer
151 views

Safe, easily detectable gas or aerosol for testing fume hoods

I've recently started undertaking a project to construct a small fume hood. So far I'm considering its use for soldering, 3d printing with ABS and polystyrene, and PCB etching using a muriatic acid/...
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1answer
475 views

Peltier Bismuth-Telluride toxicity

From what I understand, the working agent inside a peltier cooler is Bismuth-Telluride. I've read a toxicity data-sheet regarding Bismuth-Telluride here. If I were to use a peltier cooler inside a ...
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1answer
2k views

How to disarm and correctly dispose of tear gas spray?

I have a can of spray for self-protection which has expired way back in 2008. It hasn't been used at all, and it doesn't seem a good idea to just throw it away without disabling it somehow first. I'm ...
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1answer
2k views

is it possible to store formic acid longer if frozen?

I would like to know if formic acid (concentrated to 85%) is stable (no chemical reaction) when frozen. Is it a good solution to store it for many years?
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7answers
246k views

Is it actually possible to dispose of a body with hydrofluoric acid?

In the TV show "Breaking Bad", Walter White frequently gets rid of people who get in his way by submerging them in a plastic container full of hydrofluoric acid. This, at least in the TV show, ...
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3answers
12k views

Please explain why dioxygen difluoride is so dangerous

I just read this article that mentioned that dioxygen difluoride is very dangerous. The terms it uses are "awful", "violently hideous" and "deeply alarming". But I couldn't get a handle on exactly ...
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3answers
10k views

Isopropyl alcohol forming peroxides

I read in many MSDS that Isopropyl alcohol tends to form peroxides (by reacting to air OR light) which may explode when they reach a given concentration. For example: http://nj.gov/health/eoh/rtkweb/...
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5answers
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Is there any substance that's a 4-4-4 on the NFPA diamond?

A lot of the organometallics are rather... interesting compounds to work with. The most famous (among those who care, anyway) is tert-butyllithium or t-BuLi. It is the textbook example of a pyrophoric ...
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1answer
174 views

What is a level 4 carcinogen?

My friend spilt a "level 4 carcinogen" on their lap. What is it and how dangerous is it? They had washed if off after.
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1answer
403 views

Impact of detergent on internal living tissue?

There was some spirited debate between the members of my chemistry lab today about the theoretical consequences of ingesting a large amount of the detergent Triton X-100 at a 100% concentration. The ...
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1answer
154 views

How can I find whether there is oxygen present inside a well of diameter 1 m at 50 m's deep?

How can one find whether or not there is enough oxygen for breathing present inside a (dry) well of diameter 1 m at a depth of 50 m? Many people in Nepal are killed while cleaning ...
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2answers
28k views

What makes Kleenex Cool Touch tissues cool to the touch, and is it safe?

I love Kleenex Cool Touch tissues. I'm just wondering what makes them actually feel cool. For some reason it makes me think of refrigerant but I'm sure that's not in them. Is it the combination ...
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1answer
4k views

Is the vinegar and baking soda experiment safe for children?

To be more specific, could the carbon dioxide fumes produced in the reaction be harmful to a small child? I don't have a strong background in chemistry, and I was prompted to ask this question when it ...
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4answers
10k views

Homemade Rocket Fuel and Engine [closed]

I want to put an action figure in orbit but I need to know how to make a secure yet not too expensive rocket fuel engine. The design of the engine must very primitive and not too complicated. I've ...
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1answer
3k views

In practice, how dangerous is liquid oxygen as an oxidizing agent?

The Wikipedia page on liquid oxygen tells us Liquid oxygen is also a very powerful oxidizing agent [...], if soaked in liquid oxygen, some materials such as coal briquettes, carbon black, etc., can ...
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1answer
6k views

How dangerous is cobalt(II) chloride used in silica gel balls?

I was looking up silica gel beads on Wikipedia and noticed that some (and from experience most) are doped with a colouring agent to indicate that they have absorbed all that they can. The Wikipedia ...
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2answers
451 views

Is it safe to hold silicon nitride ceramic without protection?

If I have a complete silicon nitride ball bearing unit, is it safe to hold without any protection? If it cracks, or disintegrates is it also safe?
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3answers
6k views

Looking for a safe exothermic reaction [closed]

Is there an exothermic reaction which produces 1 to 2 minutes of heat at around 175 degrees Fahrenheit, no toxic gasses and is considered to be more or less safe?
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1answer
3k views

Options for long term storage of helium?

Specifically, if I wanted to purchase a large amounts of helium, what are my options for purchasing helium in a state that is suitable for long term storage? It's my understanding that if I were to ...
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2answers
621 views

Can caffeine be separated from coffee?

Is there a way to extract caffeine from coffee completely?
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1answer
899 views

What components of safety should be included in a chemistry laboratory experiment conclusion?

The focus of my question here is this: In a laboratory there is a Bunsen burner, a hot plate, hydrochloric acid, and concentrated ammonia. What would you mention about safety precautions? As students ...
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1answer
105 views

What legal guidelines exist for completeness of a Materials Safety Data Sheet?

I know that the answer to this question will vary by country, but some aspects must be similar amongst those countries that have authorities overseeing chemical and industrial hygiene. The Wikipedia ...
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2answers
19k views

How to properly dispose of sodium…or store it properly

While performing an inventory of my school's chemical storage closet today, my fellow teacher and I found some sodium tucked away in the back corner of our flammables cabinet. One container appears ...
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1answer
902 views

How can I identify and neutralize the chemical leaching out of new nitrile gloves?

I have a few cases of brand-new, nitrile gloves of a type and vendor that used to be good. But apparently, the vendor has moved manufacturing to a different country and outsourced customer service to ...
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4answers
213k views

Why add water first then acid?

From school, I remember a very important rule: first you need to pour the water and then the acid (when you need to mix them) not vice-versa. This is because otherwise the aсid becomes very hot and ...
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2answers
474 views

How can I be safe and protect myself using trimethyl tin chloride?

I will be using trimethyl tin chloride (1M in THF) in a few days for the first time. Looking at the MSDS, it looks like it is very toxic and has noxious vapors. Are there any more standard precautions ...
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2answers
28k views

What type(s) of gloves are effective against DCM and acetone?

I know that standard latex and nitrile gloves don't stop common organic solvents such as DCM and acetone. However, I was reading a Reddit thread and there were comments that if you are coming into ...
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3answers
14k views

What is the effect on humans of using dry ice and liquid nitrogen as food additives?

I have seen on a TV show that some guy uses dry ice (solid $\ce{CO2}$) to make ice cream and on an another TV show, liquid nitrogen ($\ce{N2}$) is used with tequila. Both are edible. I know that ...
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5answers
7k views

Why does oxygen not condense onto open dewers of liquid nitrogen?

I had a discussion with my supervisor today after I was a touch careless pumping down a flask with a liquid nitrogen cold trap attached. I checked, and there are reports of explosions after running ...
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3answers
8k views

Calcium carbonate toxicity

I can't make heads or tails of the information on the net — although there seems to be plenty of it, it seems contradictory. Supposedly, calcium carbonate is used in antacids—yet there are warnings ...
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1answer
1k views

Flammability (NFPA) - how is it defined?

I was reading up on a wonderful little chemical compound known as chlorine trifluoride ($\ce{ClF3}$). For a primer, check out Dr. Derek Lowe's blog post here: Sand Won't Save You This Time. The title ...
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1answer
5k views

Can class D fire extinguishers be used for other fire types than metal fires?

Burning metals like sodium should not be extinguished with standard fire extinguishers, but they require either sand or a special class D fire extinguisher. Now, if there is a fire in the lab and ...
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6answers
50k views

Handling and storing sodium hydroxide, hydrochloric acid, hydrogen peroxide and isopropyl alcohol

I'm an electrical engineering and I hope you can give me some advice as I'm not much into chemistry. I'm trying to start making my PCB (Printed Circuit Board) at home but I'd like to have some advice ...
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1answer
140 views

Is there any danger of forming explosive reaction products during the electrodeposition in Diethylene glycol?

I know that perchloric acid could be potentially explosive and some organic solvents could form dangerous peroxides. I am going to do an electrodeposition in diethyleneglycol solution containing $\...
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1answer
4k views

What is the meaning of the '2' on some Compressed Gas Hazard signs in the lab?

The main chemistry prep room at my institution (and also at the ambulance station) is labelled with the standard green compressed gas sign. However, there is a small '2' included within the diamond. ...
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2answers
5k views

How does chloroform degrade nitrile gloves?

Many of us have experienced the failure of nitrile gloves when exposed to chloroform. What's going on at a mechanistic level when this occurs? I would guess that the chloroform dissolves some of the ...
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2answers
1k views

Polypropylene 55 gallon drum

Can a polypropylene 55 gallon drum previously filled with chemicals used in the chrome plating process (possibly Nickel Sulfate) ever really be "cleaned out" for re-use? Can polypropylene ever absorb ...

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