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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23 views

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
32 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
40 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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54 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
73 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
31 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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0answers
19 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
69 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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34 views

Why chemicals bottles (plastic) have paper seals?

I have my film developer and fixer in the plastic bottles, also I have glycerine and propylene glycol. They all have paper seals (in caps) that those chemicals get wet and destroy - they just fell ...
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1answer
32 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
53 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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43 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
77 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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31 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
70 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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53 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 ...
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1answer
120 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
120 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
274 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
77 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
39 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
296 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
97 views

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

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 ...
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32 views

Which is the more effective home insecticide? Boric acid or borax?

I recall my late father introducing me to one of either boric acid or borax... as a relatively low human toxicity very effective insecticide. The thing is, I cannot remember which chemical my father ...
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1answer
115 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
127 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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288 views

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
129 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
975 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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0answers
301 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
38 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
165 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
408 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
143 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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2answers
95 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
55 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
249 views

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
189 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
66 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
167 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
589 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
47 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
117 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
321 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
3k 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
679 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
583 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
61 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
302 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
2k 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 ...