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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22 views

Lead exposure risks [closed]

I work in a lab where I use methylammonium lead triiodide dissolved in DMSO and GBL. I know DMSO penetrates skin easily, and obviously lead is toxic. Today I accidentally splashed some on my arm, and ...
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Chemical safety information: Where to look to find out how poisonous poisons are?

Could someone point me toward a primer on how to read the toxicity warnings on standard chemical data sheets? Or alternatively, where one should look for more precise information than is contained on ...
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1answer
165 views

White growth on unopened bottle of chlorotrimethylsilane

I have a white, moldy-like substance that has been growing near the cap of an unopened glass container filled with TMSCl. It has spread to form a thin, powdery coating on all of the other containers ...
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1answer
97 views

HCN, or my nose says I'm dead [closed]

As you see, I still post... I studied chemisty decades ago (and when I was through with all the compulsory practica, I was sent to a computer chemistry workgroup and politely suggested to never touch ...
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How can a detergent “designed for sensitive skin” warrant the “corrosive” hazard symbol?

The dish-washing detergent, which you can find an image of here, has the following hazard symbol on its back: On the back, it additionally says that if it comes in contact with the skin, you should ...
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How do I understand exactly how hazardous a material is based on SDS?

I work with a lab occasionally and get asked often if a chemical is safe to breathe, how hazardous is it if it lands on skin, etc. For the most part, I'll try to go to an SDS and look it up. The ...
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1answer
43 views

Phosphoric acid spill cleanup

While working with some rust converter (MSDS, ~20% phosphoric acid by weight), a sequence of events that would make Rube Goldberg proud led to me spilling about 500mL of it all over the place. Yes I ...
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25 views

Standard practice for keeping salts dry

I should point out first that I'm not a chemist, but I'm currently doing a little bit of chemistry; this should clarify that I don't have formal training in a chemistry lab (other than some basic chem ...
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1answer
85 views

Are there safe inks that allow one to eat a fish after painting it?

Just came across a specific type of art called Gyotaku where specific types of ink are used to paint over one side of a fish and then a paper (rice paper, shoji paper, ...) is placed on top in order ...
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27 views

When multiple sources give the content of an ingredient my an unqualified percentage, can I safely assume this is by weight? Or; it's not a wart

I am trying to make a simple scented shampoo and body soap for my own use and for Christmas gifts. I statr with a base of 32 oz – (a bit under a kg) of a mild commercial castille soap (Dr. Bronner’s ...
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2answers
73 views

Is there a safe way to neutralize bleach at home [closed]

I don't want to simply replace one hazardous chemical with another. The bleach is stubbornly clinging to my shower walls and I feel its effects every time I take a shower. Ascorbic acid seems like the ...
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1answer
61 views

What are the consequences of mixing Ferric Chloride Solution, distilled vinegar, baking soda and water? [closed]

I was attempting to etch and blade with a ferric chloride solution. I did not have enough so I filled a glass with vinegar and water (3 parts vinegar to 1 part water) then added 2 oz. of ferric ...
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2k views

Guidelines for home generation of hypochlorous acid disinfectant from salt water [closed]

I bought a home generator for making hypochlorous acid by electrolysis of a water and salt solution. I would like to figure out guidelines for safe and effective use of my generator. I have found ...
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1k views

Is it safe to look at a mercury gas discharge tube? [closed]

As part of a chemistry course, I recently observed a demonstration in which the instructor electrified a mercury gas discharge tube (the tube looked something like this image). The glow from the tube ...
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3answers
68 views

Does aluminium foil, warmed up by sunlight, harm human health? [closed]

I must lightproof and block sunlight in new bedroom. I can't afford blinds or window coverings. I don't use garbage bags, because a plastic bag baking in the sun may emit harmful chemicals (see Home ...
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General Question about transferring Solution from containers (Workplace Related)

At my workplace we will soon begin diluting a solution to specific concentrations, this is done within a specific container. The solution to be diluted is provided by a manufacturer in the following ...
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2answers
73 views

Is it safe to combine sodium hypochlorite (bleach) sodium triphosphate (TSP) for cleaning?

I've heard this combination can be particularly effective at cleaning biofilms, perhaps because the TSP is a surfacant, allowing bleach to "attack" more layers of the biofilm. However, I'm ...
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48 views

Are burns from Lye or Potash that bad?

I read that the chemicals potassium hydroxide and sodium hydroxide are extremely corrosive and will cause severe burns but I also see videos of people saying that if you get lye on you, then just wash ...
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43 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
216 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
124 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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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
174 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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76 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
115 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
59 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
162 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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58 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
53 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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2answers
4k 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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64 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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1answer
23 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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93 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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73 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
197 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
71 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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38 views

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
80 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
63 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
80 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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3k 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
108 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
110 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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111 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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