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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Ethyl Acetate: how to store

I'm a 3D printing hobbyist and a few months ago I bought some Ethyl Acetate after learning online that it might have a similar effect on PLA as acetone has on ABS. From the tests I made, I was either ...
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1answer
51 views

Hydrogen evolution during thermal spray

Firstly, let me state that I'm no chemist. My specialty is in thermally applied coatings such as electric-arc metalizing. During the course of my career I've always been presented with vague ...
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1answer
321 views

I (might) have accidentally combined these mold-killers at home: Any adverse reactions?

A trailer is a small enclosed space. About 2 months ago we had some mold and I applied some mold killer to a few spots that I could not remediate. Below I've listed 2 products I used. (I definitely ...
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1answer
342 views

How to determine fire hazard of heating ethylene glycol to dissolve borax and boric acid

I am looking to replicate instructions provided in the last paragrph of this article that requires dissolving borax (Sodium Tetraborate decahydrate ($\ce{Na2B4O7·10H2O}$)) and boric acid in ethylene ...
3
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1answer
365 views

Does nitrogen deaeration need to be performed in a fume hood?

I have a couple electrochemical cells I will need to sparge (deaerate) with nitrogen prior to and possibly during my experiment (the solution is .1 M NaOH). Does this need to be done in a fume hood? ...
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52 views

What should I do about working in a laboratory that I believe is unsafe? [closed]

I currently work in a lab that frequently gives me anxiety about safety. We work with toxic fumes daily. The sliding sashes on the fume hoods are held up by cinder blocks. There is a large crack in ...
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96 views

Using Ethylene Glycol as anti-freeze in a biodigester gas storage system

I am busy building a bio-digester to produce biogas for cooking/water heating in a cold climate. I am using the 3 IBC tank solution. Tank 1 is the digester itself. Tank 2 is the gas storage unit. ...
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1answer
1k views

Is it safe to evaporate hydrogen peroxide in test tube? [closed]

Is it safe to evaporate 3% hydrogen peroxide in test tube? What will be left in the test tube if the solution totally evaporated?
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Can I eat the lemons after I have used them as a battery?

After completing the lemon battery experiment, can I eat the lemons when I'm done? More broadly, what will happen to the lemons? What are the chemical reactions, what chemicals might be present/...
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8k views

What is the liquid coming out of these Duracell batteries? [duplicate]

I picked up a remote control to a DVD player that I had not used in a couple months. The remote control was stored in a clean plastic bag. The bottom of the remote control is covered with a liquid. ...
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132 views

Toxicity of vanadium in pottery

I mix and develop glaze recipes for midfire stoneware (fired to 1220°C). The colorants in pottery are mostly iron, copper, cobalt, tin, titanium, chrome, and a few other transition metals. Many of ...
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Ductless fume hood for acetone?

Administration on my campus has become worried about the lack of a fume hood when using acetone in the 3D Print Club. I'm helping in the process of picking one out. They do acetone vapor smoothing on ...
10
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2answers
303 views

Does a zinc metal coating react with coffee in a coffee grinder?

I'm restoring an old coffee grinder and I want to give the grinder mechanism a nice zinc / silver coating. But I read it is not safe for zinc to be in contact with acidic foods. When I look at the ...
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1answer
3k views

Phenol smell from hands

It is a question which I faced when I was in Senior year in high school, I used my hands to handle phenol which has turned pink due to oxidation, I washed my hands with all kind of soaps but smell in ...
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1answer
2k views

Cleaning up dispersed potassium hydroxide (KOH) spill?

So I tried to replace a dead triple-A alkaline battery in a waterproof compartment; it had leaked fluid + gas which had built up a bit of pressure: When opened, the material (about a dozen tiny ...
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190 views

Aluminium etching

I'm trying to etch a very fine pitch ($\pu{0.5 mm}$) aluminium stencil for use with SMT printed circuit board making. I've done some reading on the topic and found that the safest way probably is to ...
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1answer
158 views

Can cis and trans isomers have widely different flash points?

Sigma seems to have two products listed for sale as "Cinnamic Aldehyde". One compound clearly seems the trans isomer but the other one seems like an unspecified mixture. (They even have two different ...
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252 views

What is substance that has high melting point in its powder form?

In laminated glass bending process 2 glass sheet will be superposed in a furnance.The seperation powder will be interposed between layer for avoid 2 glass sheet being bound together. I'm trying to ...
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1answer
195 views

What is the correct way to transfer large volumes of chemicals?

I am an engineer starting a film developing and processing lab in my house for personal use. I am currently using a bathroom, and am concerned about contaminating my chemical process and the bathroom ...
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0answers
506 views

Does this wire gauze contain asbestos? Can I tell visually?

I bought a wire gauze which claimed to be made of ceramic, and asbestos-free. However, I bought it from Amazon (not a trustworthy source), and I see fibers around the edge of the center. Is there a ...
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2answers
3k views

Why is use of calcium carbide as an artificial fruit ripening agent banned?

Fruits like mangoes can be ripened using agents like ethylene, acetylene or calcium carbide. Of these, the latter is dangerous and is banned in most countries. Wikipedia says it is because calcium ...
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1answer
539 views

Why does ethanol have a health rating of [2] in NFPA 704 whereas methanol, which is far more toxic, has a rating of only [1]?

Why Ethanol has the blue health hazard rating of 2 in NFPA 704 where as both Acetone and Methanol which are far more toxic than Ethanol have a rating of only 1? (Click on each link to see the NFPA ...
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1answer
22k views

To add acid or base to water

There is a rule stating that we shall add a strong acid to water, and not the other way because of safety; if we would add water to the acid, the reaction could be dangerous (boil). What about adding ...
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1answer
1k views

What happens to potassium iodide in the “elephant Toothpaste” reaction?

General Questions on "Elephant Toothpaste" Equations: 1)$\ce{~2H2O2(aq)->2H2O(l) + O2(g)}$ Context: I have a few questions on the reaction commonly referred to as "Elephant Toothpaste". You ...
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2answers
229 views

Why do seemingly reliable sources give NFPA 704 Health ratings ranging from 1-4 for elemental mercury?

Recently a user posted the question Do Mercury have a NFPA 704 classification?. Why the present question is not a duplicate: Although there is no accepted answer to the above question, I think it's ...
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1answer
454 views

Forming hydrogen sulfide from electrolysis of sodium thiosulfate

So I was doing electrolysis on two silver electrodes and sodium thiosulfate. Some observations The voltage drops extremely fast from 2 V to less than 1 V in 15 minutes, possibly because of the ...
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1answer
2k views

Will sodium metal stored in mineral oil explode on contact with water?

Will sodium metal stored in mineral oil, like this one offered on amazon.com, explode if it were immersed in water?
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650 views

Should I have a pair of shoes that I wear only in the lab?

I bought some very nice heavy leather boots when I was working in a solid state synthesis lab, mainly with selenium and sulfur compounds, a few years back. I probably did spill small quantities of ...
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1answer
94 views

Pesticide Edolan U

I have recently become aware that old woolen blankets from the 1940:s to the 1970:s often contain the pesticide "eulan U 33" or "Edolan U" and wonder what is the best way to dispose of these. Ordinary ...
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9answers
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Realistic chemical spill accident in high school chemistry class

In a story I'm writing, a teenager spills chemicals on herself in a high school chemistry class, causing her to be put under the safety shower. The spill destroys her clothes and causes minor burns. I ...
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1answer
310 views

The safety of homemade slime

Disclaimer: I am not a chemist, but I figured this may be the place to ask. So, recently, there has been a lot of news going around about the homemade slime burning a child's hands and I got curious ...
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1answer
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HDPE bottle for gasoline?

What are the risks of storing E10 gasoline in a gallon HDPE container for a few months, vs storing in a proper plastic fuel can? Assuming the HDPE gallon is thick (used for Hydrochloric acid before, ...
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2answers
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What goes on the NFPA 704 for multiple chemicals?

If you have a chemical that is classified (Health, Fire, Reactivity) 2, 1, 2. And another chemical that is 1, 3, 2. If these two chemicals are stored together, what is put on the storage container/...
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1answer
97 views

The “hazardousness” of artificially made sweteeners

In school I learned of the "possible hazardity of artificial sweeteners." But that was some time ago, now. I think that science should have caught up by now. My question is as follows. ...
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416 views

Baby bottles accidentally steamed with soft plastic teether - melted - Bottles still safe? [closed]

I'm not sure who to ask so have been googling around -- My husband accidentally steamed our new teether for our infant son with the bottles. What he didn't remember/realize is that you're not supposed ...
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0answers
53 views

Is it a good idea to build a small scale ozone AOP reactor in my garage?

I have some interesting findings from my work (no conflict of interest), and I have been thinking to build an ozone lab in my garage to verify my ideas. What safety issues should I be aware of? The ...
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1answer
97 views

Detection of Tungsten Hexafluoride

I'll be doing some work (as a software engineer) with a vacuum process chamber that consumes various nasty gases. There are numerous safeguards in the system, but as a cautious type, I decided to ...
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2answers
2k views

Why should fire extinguishers containing carbon dioxide not be used on magnesium fires?

As the title states, why should $\ce{CO2}$ fire extinguishers containing carbon dioxide not be used on fires with magnesium metal? I understand that $\ce{CO2}$ extinguishers work by displacing oxygen,...
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2answers
507 views

Does mercury have an NFPA 704 classification?

I've searched on a lot of websites if elemental mercury (Hg) has an NFPA classification but I can't find any. Does mercury have an NFPA classification?
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139 views

Are there any dangers while handling cobalt dichloride?

I use a desiccant named Drierite to remove water from air in experiments. It is composed of $98\%\ \ce{CaSO4}$ and $2\%\ \ce{CoCl2}$. Every once in a while the Drierite gets saturated with water vapor ...
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0answers
54 views

Creating Floc in the classroom

I'm the youth ed manager at Denver Water in Colorado. We do a water treatment demo in the classroom, and currently we use the first part of the Winkler DO test to create floc. I'm looking for a better ...
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1answer
14k views

What happens when you mix Pine Sol with Clorox

I have read all these rumors online that mixing these two solutions will produce the chloride gas. I accidentally mixed these two while doing berthing cleaners in the communal restroom and felt very ...
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278 views

Mirror reaction - avoiding silver nitride

I am interested in experimenting with depositing silver on glass (mirror). I've read several papers and watched youtube videos but wish to be better informed about the risk of explosion. The mixture ...
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0answers
101 views

Chile 2017, One of the Largest Fires in South America: Wood Ash Derivates for Industrial Applications [closed]

Hi: We're a group of people who wants to help people, domestic animals and wildlife recovering from this fire. Summary: We're having in Chile one of the largest fires in South American history. More ...
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2answers
2k views

Emergency shower for nitric acid spills

Disclaimer: I'm asking this because I am curious. Not because I'm actually handling nitric acid. In another answer I was reading, the poster mentioned that if you spill nitric acid, you shouldn't ...
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2answers
7k views

Does latex protect against acids?

I heard somewhere that some plastics are pretty good at resisting decently strong acids. To what degree is this true? Does latex protect against corrosives? Are plastics good at "resisting" bases or ...
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1answer
92 views

What does the label of stability: 0 mean on an MSDS sheet?

I was reading an MSDS sheet on bleach. There is a section named NFPA. Under that is are the words, Health Hazard: 3, Flammability:0, Stability:0 Does that mean that Bleach is highly unstable?
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2answers
1k views

How does a mercury detector work?

I am new to chemistry and saw a "portable mercury vapor monitor." How do these machines work?
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1answer
832 views

extraction/isolation of Curcumin from Turmeric using ethanol

I want to extract/isolate Curcumin from Turmeric using ethanol solvent, already know paramaters such as optimum particulate size, optimum temp (140 degrees F) etc, I need to know how to safely set up ...
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3answers
2k views

Preventing build-up of Diethyl Ether Peroxides

I've never stored Diethyl Ether before but am thinking of producing minor amounts myself and storing said Ether inside of glass/PTFE bottles. I am aware of possible pressure build-up due to vapors ...

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