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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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What is the maximum concentration of HNO3 (nitric acid) which may be handled outside of a hood?

Commercial stock solutions of HNO3 (nitric acid) are usually 70% w/w, and according to several MSDSs (e.g. here), it is dangerous to inhale it: Symptoms/effects after inhalation : Irritation ...
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3answers
78 views

How can I get this glass stopper out? Need troubleshooting!

I placed a glass stopper in a $\pu{100 mL}$ round bottom flask while my solution was still warm and let it cool overnight. Now I think I created a vacuum seal and I can’t force the stopper out to ...
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3answers
179 views

Can 32% hydrochloric acid be stored in a milk jug (HDPE)?

Can $32\%$ ($20$-degree Baume) hydrochloric acid (typically found as 'muriatic acid' in hardware stores) be stored in a milk jug? I have read that acids can be safely stored in polyethylene bottles. ...
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62 views

Gas mask for protecting against fumes from coffee roasting or grinding

A study in Toxicology Reports found that roasting coffee produces significant levels of certain compounds that may be harmful to humans (specifically to the lungs). The compounds named in the study ...
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0answers
111 views

Why add NaBH4 slowly to 4-t-butylcyclohexanone in ether solution? [Lab Procedure]

$\ce{NaBH4}$ is to be added slowly to 4-t-butylcyclcohexanone in ether solution according to laboratory procedures, but I am curious as to why that is? 4-t-butylcyclohexanone undergoes reduction with $...
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1answer
35 views

dangers of radiation question

At a recent flea market, someone was selling a surplus military device that was marked as having 900 millicuries and should be disposed of in a safe way. I picked it up to read the words. Whould 900 ...
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1answer
75 views

Safely lowering bleach pH without chlorine gas?

According to Eurekalert, by lowering the pH of household bleach (e.g., by adding vinegar or citric acid), we can increase $\text{[HOCl]}$ and consequently greatly improve the disinfecting capabilites ...
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1answer
172 views

Evaporation of concentrated formic acid and semi-concentrated sulfuric acid at room temperature

I recently looked at a reaction where CO is synthesized using formic acid and sulfuric acid, which seems to be one of the easier to control reactions for this, and obviously ventilation etc is ...
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1answer
59 views

what would happen if someone smell just a little chloroform? [closed]

I'm new in labratoary and a few days ago I smelled chloroform just for a second, out of curiosity. The next day I became very sick with symptoms like nausea, vomiting, fatigue and pain in my muscles. ...
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1answer
50 views

Hazards of trivalent chromium and hexavalent chromium

I am examining a material safety data sheet that reports on trivalent and hexavalent chromium in chemical films. It covers each type where it is used in a product individually. Is there a practical ...
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1answer
47 views

Is Reverse Osmosis Sanitizer safe to use? [closed]

The Sanitizer is called Sani-System (For Reverse Osmosis). The purpose is to get rid of the bacteria within a Reverse Osmosis system (Priority is the tank: that holds the water) -- edit Safe meaning ...
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2answers
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What dangers/risks are there in the production of carbon subnitride?

I was reading that carbon subnitride or Dicyanoacetylene has one of the hottest flames when used as a fuel, but it also is unstable and can explode easily into carbon powder (no specifics on cause). ...
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1answer
86 views

Do I really need to wear protective clothing while using isopropyl alcohol? [closed]

I recently purchased a 500ml bottle of 99% isopropyl alcohol (aka isopropanol aka rubbing alcohol) for everyday use at home. The label for the bottle worryingly states: Wear protective gloves/...
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1answer
55 views

How can I safely store highly outgassing self-pressurizing chemicals?

I have a standard copper etching solution of 1 part $\pu{10M}$ $\ce{HCL}$ and 2 parts 3% $\ce{H2O2}$ (as described in numerous places online). I previously had this stored in a tightly-sealed glass ...
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1answer
124 views

Creating water from hydrogen and oxygen [closed]

Assuming a scientist has two canisters: One with a liter of pure gas of hydrogen (single atoms gas), and one with half a liter of pure gas of oxygen (single atoms gas). The scientist desires to ...
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0answers
19 views

Question of how to Safely Neutralize Nitric Acid & Storage [duplicate]

My question is finding a safe method for neutralizing 70% ACS Reagent Nitric Acid that was used in small amounts of 1-5 ml, for an electronics process in which there will be small traces of silicone, ...
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0answers
366 views

Safest and easiest method to neutralize nitric acid

I would like to know the safest method for neutralizing 70% ACS Reagent Nitric Acid that is used in small amounts of 1-5 ml, for an electronics process in which there will be small traces of silicone ...
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1answer
45 views

Why is aluminium used to treat waste after a lab experiment? [closed]

How does adding aluminum metal pieces into a waste beaker help treat solids and liquids in the beaker so you can safely send the solids to a landfill and dispose of the liquids in the sink drain ...
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2answers
55 views

How to make dichloromethane human-friendly and safe for storage?

I use dichloromethane to polish 3D printed object as postprocessing step. Most of it is stored in darkened glass on my balcony (now at $\pu{-15^\circ C}$). What chemical reactions I need to make it ...
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0answers
214 views

What is the difference between n-heptan (CAS 93924-37-9) and branched, linear and cyclic heptane (CAS 426260-76-6)?

I am looking at the substitution of hazardous substances in my company. I would like to explain what makes the branched, linear and cyclic heptane (CAS 426260-76-6) safer than n-heptane (CAS 93924-37-...
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1answer
1k views

Do plasma globes generate ozone?

My kids and I were playing with a small plasma globe like this: After touching it we all noted a faint smell like that created by other high voltage static discharges, which I always understood to be ...
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1answer
643 views

What makes dimethyl compounds so extreme?

I've noticed that dimethyl compounds tend to have extreme reactive, including bioreactive, characteristics. Am I being misled by anecdotal selection bias, or is this generally true. And if generally ...
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1answer
386 views

Isopropanol in contact lens solution plastic bottle

I have a rather large plastic bottle of isopropanol ($99.7\%$), and I wanted to store some of it in a smaller, more handy container. I have two empty plastic bottles from contact lens solution that I ...
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1answer
55 views

Residual catalyst leaching from PETE

I am trying to look for healthy options for 5 gallon water jugs. The problem is all the plastic 5 gallon water jugs on the market are either made of #1 PETE (BPA free) or #7 (which contains BPA). It ...
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1answer
254 views

What type of gloves should be used while diluting sulfuric and hydrochloric acids?

What type of gloves should we use on hands while diluting sulfuric and hydrochloric acid? Can we use these gloves in chemistry lab to handle other acids?
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4answers
1k views

Would the concentration of oxygen around fire increase as we get close to the fire (from the outside)

Since fire require oxygen, wouldn't a fire, like those in the American forest along west coast, constantly draws in oxygen from around? And if that is so, would the concentration of oxygen around the ...
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1answer
117 views

Is HDPE affected by long term exposure to methanol?

For at least several years I'be been storing various chloride solutions with methanol as a solute in Nalgene containers, which I believe are made from high density polyethylene (HDP). But recently ...
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0answers
59 views

Have I inadvertely diethyl ether peroxides?

About 1 week ago, I used diethyl ether to wash some solid products. I dumped it in my temporary waste container, which also contains water and some other solvents like DCM. I returned today, and ...
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0answers
52 views

Plastic contaminant in the kitchen (from a heated PP bag) - toxicity, cleaning up

In short, a pot of hot soup traveled in a PP bag and landed onto the kitchen table with a vivid unpleasant smell of plastic contamination. Based on the specifics provided below, I seek to identify ...
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0answers
33 views

what solvent should i use to disinfect leaves without destroying other chemical properties

i am making a Mimosa pudica's antifungal study claims for my project at school. therefore making a product out of it. And i was about to extract the plant's chemical properties but first i dont know ...
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1answer
171 views

Reusable and safe endothermic reaction [closed]

I am looking for a reusable endothermic reaction that is safe to both touch and handle, it needs to be able to be stored in a jacket and light enough to do physical activity. Any suggestions?
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1answer
300 views

What is the Chemical Compound that has a NFPA 704 (Fire Diamond) of 2-2-1-ox?

I recently saw this fire diamond configuration of: 2 - Flammability; 2 - Health; 1 - Reactivity; OX - Extra Information I have been attempting to find a database of terms, but after turning up with ...
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2answers
44 views

Are there any guidelines for what constitutes an “organic acid” regarding storage requirements?

I am moving a large amount of chemicals to a new lab and I’m curious about any guidelines for chemical separation. I’ve seen suggestions that organic acids and non-organic acid be stored separate from ...
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1answer
54 views

questions for my 13 year old's STEM class. (Users of Potassium) [closed]

Would you please answer the following questions for my 13 year old girl's STEM class? Do you have a story about a time something went wrong using Potassium? What are some of the precautions you ...
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3answers
2k views

How are N95 masks different from dust masks?

There is a fire raging through my hometown right now. People in the area are advised to be wearing N95 masks to filter out smoke and particulates; and there is misinformation being spread that these ...
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2answers
2k views

How to properly store acids at home?

I bought different kinds of acid for experiments and home usage that I stored in secured containers into an IKEA cabinet. I just realized that despite the fact that all the containers are properly ...
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1answer
798 views

Is sulfuric acid still hazardous after it dries?

One of our housemates decided to pour battery electrolyte (which is 30-40% sulfuric acid) into a motorcycle battery on our back porch next to our laundry washer and dryer. He did so extremely ...
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2answers
301 views

Dangers of expired bleach?

I have some unopened Clorox bleach bought over a year ago (at $8.25~\%\ \ce{NaOCl}$) and read on Wikipedia that bleach naturally decomposes according to $$\ce{3 NaOCl (aq) -> NaClO3 (aq) + 2 NaCl(...
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0answers
28 views

Distillery Transfer Hoses

I was hoping an actual person could offer me some advice. I work in a craft distillery and I'm getting a lot of mixed information on how compatible PVC is with high-proof alcohol. It definitely seems ...
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0answers
141 views

Why is Lithium Fluoride much safer than Sodium Fluoride

I've looked at the MSDS of Lithium Fluoride and Sodium Fluoride. It really seems that Lithium Fluoride is much safer to work with. Why is that, if both are in the Alkali Group?
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0answers
33 views

How to safely change the color of a fire tornado?

So I've been watching a lot of fire tornado videos and I came across one that had a reasonable and safe setup (around the 3:23 mark): Fire Tornado DIY Is there a way to change the color of the fire ...
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1answer
336 views

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
49 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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0answers
217 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
167 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 ...
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1answer
199 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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45 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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0answers
44 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
490 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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1answer
1k views

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/...