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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28 views

Safe sprayable fast-drying liquid for mould release agent [closed]

I am looking for a safe sprayable (will be sprayed as a fine mist) liquid that I can use as a base for a mould release. The mould release is simply melted paraffin wax suspended in the liquid which is ...
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0answers
40 views

Does davis safety lamp detect explosive gases in ship compartments? [closed]

I feel managers at Bangladesh ship breaking yard are not properly caring for safety of workers. Many workers die in explosions while salvaging metal. documentary available on YouTube by National ...
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1answer
3k views

Is this poor laboratory safety?

I'm a formulation chemist. My co-worker, is also a formulation scientist but has no previous formal training in chemical safety or lab chemistry settings. I always work in the hood unless I’m just ...
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1answer
72 views

Safest way to conduct a reaction with bromine under reflux conditions

I am conducting an electrophilic aromatic bromination reaction according to literature. The substrate and intended substitution pattern do not matter, but the reported procedure requires the dropwise ...
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1answer
118 views

What is the size in m³ of a toxic benzene cloud when if 20.000 kg liquid benzene would vaporize?

Benzene is carcinogen, The short term exposure limit for airborne benzene is 5 ppm for 15 minutes see https://en.wikipedia.org/wiki/Benzene#Benzene_exposure_limits I would like to know which volume of ...
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3answers
4k views

Why can radioactive contamination be spread by people?

So I am reading a book called "Voices from Chernobyl" where witnesses, nuclear plant workers, firefighters and other persons involved in the 1986 accident give testimony of their experiences....
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6answers
9k views

How does ammonium nitrate explode on its own?

I thought ammonium nitrate was an oxidizer that needed to be mixed with fuel to form a high explosive (e.g., ANFO). But apparently there have been accidental explosions involving just the "...
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2answers
138 views

Determination of percentage of Methanol in an Alcohol based hand sanitiser [closed]

Note: I am looking for advice on a chemical test - not a sermon. I expect that this is entirely on topic in this forum, downvotes and sermon comment notwithstanding. More than about 5% of Methanol in ...
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41 views

How do you purify gases formed in electrolysis with a potassium hydroxide electrolyte?

I am interested in the $\ce{KOH}$ vapor that is released with my gasses during electrolysis. I have two questions. What would be the best place to start research on the $\ce{KOH}$ vapor produced in ...
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1answer
68 views

Laboratory setup for the distillation of sulfuric acid

Purification of Laboratory Chemicals, 5th Edition, by Armarego, reads (p. 53): Reagents such as water, ammonia, hydrochloric acid, nitric acid, perchloric acid, and sulfuric acid can be purified via ...
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1answer
56 views

What is the safe level of energy output for hydrogen combustion at home?

With confinement, my son would like to do some home experiments for a class. So far, he has a good setup that seems sound for the electrolysis of water. A later part of the experiment would combine ...
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1answer
64 views

can i use an isobutane stove (like jetboil) or butane blowtorch with borosilicate glass?

I don't have a bunsen burner, but have a camping stove (similar to https://www.amazon.com/Stansport-183-B-Isobutane-Backpack-Stove/dp/B004EPWM5S) and a blow torch. I'd like to do some distillation ...
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316 stainless steel and high concentration, high temperature Hydrogen Peroxide

I'm looking at doing some experiments with small scale rocketry and I need to find the right materials for this project, where I will be burning through lots of HTC (peroxide above 90% concentration). ...
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54 views

Spraying difluoroethane into an enclosed space

I'm working on developing physics lab activities that my students can do at home during the covid quarantines. For an activity involving waves and thermodynamics, I came up with an experiment at home ...
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1answer
52 views

Treating styrene in the atmosphere

I was actually inspired to ask this question in certain circumstances. In the outskirts of my city, there happened to be a styrene gas leak early morning today which killed thirteen and hospitalized ...
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562 views

How much time liquid mercury takes to evaporate?

I asked before about a thermometer that I broke yesterday. To summarize, I broke a mercury thermometer in my bedroom, which is a place where is difficult to have sure that I get rid of all mercury, ...
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2answers
54 views

cheap anti-fog agent!

What are some safe and widely available alternatives to specifically formulated anti-fog sprays/treatments? Specifically for use on glasses, goggles, and face shields.
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22 views

Putting sanitiser in PVC bottles [closed]

can I put hand sanitiser in PVC bottles or must the bottles be PET. With the shortage of bottles I am keen to know if a 70% ethanol or isapropyl based sanitiser will distort or soften a PVC bottle in ...
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75 views

Safety of IPA and sodium hypochlorite mixture?

Is the mixture of 97% isopropyl alcohol and 0.5% of sodium hypochlorite safe? Do they react together and form any compounds ? Does this mixture present more danger to humans and animals than its ...
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34 views

At what temperature does a polyester release toxic gases?

I've bought a "Shrinky Dinks" printable sheets and now I'm feeling unsure about using it since I've read that heating polyester materials may be very harmful for health, and the final purpose of this ...
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2answers
131 views

Producing hydrogen sulfide at home - how dangerous is it? [closed]

When I was a kid, I used to go to the pharmacy to buy sulfur and iron powder, then mix it together and heat it until it starts to react into iron sulfide. Put a chunk of iron sulfide into some vinegar,...
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1answer
64 views

Is sodium percarbonate the safest and by weight the most efficient oxygen generator? [closed]

I have been reading about $\ce{Mn}$-catalyzed reaction of sodium percarbonate and water to produce gaseous oxygen in medical emergency situations. This seems safe due to its reagents and products, ...
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Formic acid and carbon monoxide outgassing from latex mattress

Formic acid is used as a coagulant to turn rubber tree sap into latex, formic acid also decomposes to carbon monoxide. Does this mean things like latex mattresses have the potential to off-gas carbon ...
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1answer
75 views

Is it safe to touch salts given to you for analysis? [closed]

In our chemistry practical paper (High school level), Inorganic salt analysis is one of the questions asked. We are given a petri dish with a sample of salt and are asked to find the cation and anion ...
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2answers
60 views

Lab goggle recommendations?

I'm taking my first chemistry class with a laboratory component this quarter. My first laboratory session was earlier this evening (observing simple metathesis reactions). While I found the lab work ...
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1answer
4k views

Neutralizing a sulfuric acid spill

From my AP Chem Prep Book: What should you do if you spill sulfuric acid on the countertop? A) Neutralize the acid with vinegar. B) Sprinkle solid NaOH on the spill. C) Neutralize the acid with ...
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What happens when these 3 chemicals are mixed in air? [closed]

What happens when these 3 chemicals are mixed in air? Pentanone/Di-isopropyl Ketone (2,4-Dimethyl-3-Pentanone) Iodine, reagent grade Sodium Iodide, reagent grade. The 3 parts make up a liquid in ...
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1answer
38 views

Safety requirements for the laboratory work with salts of heavy metals [closed]

So I am going to start a set of experiments involving the following metal nitrates: Cobalt nitrate hexahydrate Barium nitrate Cerium nitrate hexahydrate Ammonium nitrate nonahydrate Iron(II) nitrate ...
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1answer
72 views

How dangerous is the Mercury-Thallium filled thermometer? [closed]

What's the amount of Mercury and Thallium in a typical low-temperature thermalmeter? How poisonous is Thallium when bounded with Mercury?
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1answer
1k views

How to dispose of NaOH solution? [closed]

I have a range of sodium hydroxide solutions with different concentrations. (from 1.0 mol dm^-3 to 0.5 mol dm^-3). The max volume of each is 100ml. How can you easily dispose of these? Can I pour them ...
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4answers
91 views

Will ground glass joints relieve pressure non-catastrophically?

I need to heat a fluid for seven days at a time. The fluid goes in round bottom flask that is suspended in a water bath. The test fluid will decompose and generate a small amount of gas over time. ...
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1answer
69 views

Appropriate container for storing/keeping chromic acid? [closed]

I am planning to make chromic acid, however I the information for keeping chromic acid are conflicting. Can it be stored in a glass bottle even though it's used as a glass etchant? Also I saw some ...
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72 views

Distillation of oxalyl chloride

May I use water as a condensing medium while distilling out oxalyl chloride? As oxalyl chloride reacts with water and the products are $\ce{HCl},$ $\ce{CO}$ and $\ce{CO2},$ when there is a leak or ...
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2answers
142 views

Sodium + water reaction, noxious fumes?

I was reacting pure sodium and tap water, and at one point I put some splattered sodium back into the water. I observed fumes that reacted with my respiratory system, producing a burning sensation. I ...
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1answer
34 views

How to estimate the maximum chlorine hazard from 1 g of Palladium(II) chloride? [closed]

I plan to work with an electrolyte that contains 1 g of Palladium(II) chloride. I am trying to estimate how much of a hazard this system could possibly pose (and provide ventilation, chlorine ...
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1answer
75 views

Cup with vinegar/salt/copper solution previously in it ran through dishwasher

Someone enjoys making jewelry, and saw an online tutorial saying that you can mix equal parts of vinegar and salt, and leave copper in it for a while to oxidize it, and turn it green. After doing ...
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88 views

Highly concentrated NaOH solution at high temperature vs borosilicate glassware and cellulose?

I've read here on stack-exchange that NaOH will react with glass through the following reaction: 4 NaOH + SiO2 ⤑ Na4SiO4 + 2 H2O I would like to briefly heat a highly concentrated NaOH solution to ...
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1answer
245 views

What kind of metal drums are used to store Hydrochloric Acid?

I would expect Hydrochloric Acid to be stored exclusively in glass or plastic containers, but I was surprised to find Honeywell offers it for sale in 30Kg metal drums (Link). I think Hydrochloric ...
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36 views

Safe & Convenient method to hydrate CaO into Ca(OH)2?

I'd like to prepare a solution of $\ce{Ca(OH)2}$ from $\ce{CaO}$. Ideally I guess I'd go for slowly adding the powder to a water-cooled round flask containing pure water but I have no mechanism to ...
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1answer
168 views

How can I neutralise H2 gas without burning it? [closed]

I was thinking of maybe making it bubble into a solution containing something that would react with H2 yielding either a dissolved substance or a precipitate from the reaction. Maybe a solution with ...
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0answers
107 views

What is the pale green solution from dissolving sodium hydroxide in a stainless steel flask?

I have previously used drain/sink cleaner gel based on sodium hydroxide but noticed that caustic soda crystals were a lot cheaper. I decided to experiment with making my own cleaner. I bought a 1 ...
2
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1answer
247 views

Safely mixing methanol and chloroform [closed]

Sorry for what is likely a naive question. I haven't worked with chemicals at all and have only had some brief lab safety instruction. I need to create a mixture of chloroform and methanol 2:1 for a ...
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2answers
220 views

Is there a quantitative test/analysis technique that can determine if some chloroform has degraded into phosgene?

Before I go to use any chemical that I've had in storage for a while, I try to check if it's degraded into something else (e.g.: checking the $\ce{H2O}$ content of $\ce{H2O2}$, checking for $\ce{H2O2}$...
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3answers
374 views

Why do most explosives have symmetrical chemical structures?

I was just turning the pages of my chemistry dictionary, when I found the structure of TNT (Trinitrotoluene): ...there after I got interested in its symmetry as an explosive, and started looking for ...
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1answer
89 views

Why should I not use different battery types together?

Everyone knows about this but I'm curious about why one should never mix batteries of different types. By type I mean the same shape of the cell like AAA but with different chemical reactions and ...
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1answer
44 views

Formaldehyde safety levels

I've obtained a simple air quality analyzer which measures several items, formaldehyde concentration among them. While I cannot vouch for its correctness, I found the values measured during the last ...
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2answers
782 views

Safe and responsible disposal of aluminum chloride?

This answer affirms that reacting aluminum with HCl is a (seemingly convenient) way to produce hydrogen for use in other experiments, but the byproduct, AlCl3, is rather nasty. What's the best way to ...
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1answer
103 views

What chemical regularly transported by road in the UK would cause serious injury/loss of life if it escaped in a road accident? [closed]

I'm writing a story where a serious multi-vehicle pileup happens in the winter during foggy weather. I need the fallout from this to include the escape of a substance that will cause significant ...
2
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1answer
236 views

Is it considered safe to sonicate with flammable solvents?

I use a sonicator at work in a cleaning process. It involves sonicating acetone, NMP, and IPA. We would like to move forward with other flammables as well. We currently do the work in a hood, but no ...
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1answer
235 views

How can I increase the viscosity of dilute hydrochloric acid

I'm cleaning the mortar off a new clinker brick wall. Walls actually. I hate this job. The builder told me to wash down the wall with weak HCl, leave it for a minute or two, and then spray it off with ...

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