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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1answer
185 views

Are there IP limitations on (M)SDS documents?

Much effort is put in putting together (M)SDS documents: Many companies offer the service of collecting, or writing and revising, data sheets to ensure they are up to date and available for ...
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1answer
2k views

What is the possible side product when mixing citric acid, NaCl, Cu, Al, H2O2, and an unknown photoresist?

When etching circuit boards, a somewhat commonly used substitute for (expensive and messy) ferric chloride is a mixture of an acid, a source of chloride ions, and hydrogen peroxide. If I understand ...
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1answer
5k views

What could happen when mixing bleach with other cleaning residue?

I have a wall covered in mold. I have used various cleaning wipes attempting to clean it, including a vinegar mixture. I now want to spray the wall with a bleach cleaner. I am concerned for fumes from ...
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2answers
4k views

What's the composition of gun smoke and is it dangerous?

Background I've been conducting an informal (i.e. mental) risk assessment of visiting gun ranges. There are a couple of obvious sources of hazard: Injury by bullet Hearing loss Hot casings flying ...
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1answer
3k views

What are the specific dangers associated with Grignard reagents?

I would like to know if anyone has had any specific safety-related problems with Grignard reagents. I have taught the year-long introductory Organic Chemistry sequence for about 15 years and have ...
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2answers
872 views

Method to synthesize KAu(CN)2 (or KCN)?

Every reasonably effective method of electroplating $\ce{Au}$ onto another metal's surface (e.g. $\ce{Cu}$,$\ce{Ni}$,$\ce{Ag}$, etc.) involves use of $\ce{KAu(CN)2}$ or in some cases $\ce{KAu(CN)4}$ ...
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0answers
81 views

How dangerous are non-soluble trivalent thallium compounds?

I am PhD student in solid state physics. I have been working with a fine powder of a transition metal oxide containing trivalent thallium. The oxide is not soluble in water. In my university, ...
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2answers
724 views

Can I use lye as a cooking leavener instead of baking soda?

I asked this question on the cooking site, but got unsatisfactory answers: https://cooking.stackexchange.com/questions/65520/can-i-use-lye-as-a-leavener-instead-of-baking-soda I'm interested to try ...
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3answers
1k views

Controled burn colored fire and safety

I am a martial artist who uses fire weapons in my shows. I am wondering how I can get the flames to be different colors. I've done some research about it, and have found that the salts of some ...
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1answer
910 views

Is Tollen's test safe?

Tollen's test is an important test to distinguish between aldehyde and ketone. $$\ce{2 [Ag(NH3)2]+ + RCHO + H2O → 2 Ag(s) + 4 NH3 + RCO2H + 2 H+}$$ But is this reaction safe? Is there any threat in ...
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1answer
135 views

To what degree an N99 active coal filter can protect against products of burning paraffin oil?

I sometimes do firedance and a part of it is waving a stick with burning endings made of Kevlar soaked in paraffin oil. I started to be a bit concerned about how healthy is it to inhale lot of ...
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1answer
103 views

Can you tell me which one of these substances are highly or easily flammable? [closed]

List is next: ethylene glycol (EG), diethylene glycol (DEG), triethy-lenglycol (TEG) basicly liquids from polyol groups, I know alcohols are flammable but what about polyols? and how easily
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10k views

Do polycarbonate and/or polyurethane have latex?

I have a severe latex allergy which hinders my health every day via hives, inflammation, and breathing trouble. I am trying to find a cell phone that is not going to cause anaphylaxis or other ...
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2answers
4k views

Is mixing ammonia and bleach spray in the same parcel of air considerably dangerous to health?

I've read a few articles advising not to mix bleach and ammonia in the same room because it makes chloramine gas. But my boyfriend and I are having an argument - he thinks that since those articles ...
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1answer
527 views

Is there an easy way to make PVC from PVA?

Say, I took Elmer's glue (or a similar Polyvinyl Acetate) and I inserted some Chlorine Tabs and warm it up while stirring. Would the electronegative Chlorine turn some of it it into Polyvinyl ...
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1answer
11k views

Why are lab coats required in chemical laboratories?

Well at first it seems kind of awkward but let me tell you what I was thinking from past few days. Currently I am studying and go to school. In school, whenever we have to go inside a chemistry lab ...
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1answer
990 views

Obtaining magnesium oxide from magnesium hydroxide

What's the simplest and safest DIY way to obtain magnesium hydroxide to magnesium oxide?
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0answers
369 views

Brewing tea with deionized water

I am wondering what efect brewing tea (let us assume for the sake of simplicity it is green tea, brewed at about 80 °C) in deionized water might have on the product. Will the lack of ions in the ...
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4answers
36k views

Sulfuric acid fumes from cleaning shower drain

This morning a workman came by to my newly rented property to fix a few things, among which a slightly blocked bathtub drain. He let some mild water run continuously and he poured down a chemical, ...
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3answers
633 views

Simple practical, non-toxic, non-flammable reaction for slow release of CO2

Someone I know (not me) has recently had problems with bed bugs. I have advised him his best bet is to (1) Buy a kick-ass steam cleaner and nuke the brutes from orbit, (2) get a professional pest ...
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2answers
163 views

Is a polycarbonate beer mug appropriate for serving alcohol?

Are polycarbonate & acrylic beer mug, whiskey glasses safe for serving alcohol? I mean does it leach or dissolve? What are the harmful effects in long run if any?
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1answer
107 views

Why is the sneaky method of smothering a grease fire more effective?

In this demonstration, a grease fire is temporarily extinguished if you put the cover on the pan, but reignites as soon as you take the cover off. However, if you slowly slide the cover across the ...
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1answer
136 views

how to store solvent in laboratory? [closed]

I am organising chemicals and solvents in laboratory... being less specific ( as it would a big list of chemicals to provide here in my questions)... I wanted to know... how can we arrange solvents in ...
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1answer
631 views

Need 28% acetic acid from 98% glacial acetic acid

i need to make a solution of a 28% acetic acid, what i get is 98% glacial acetic acid. If someone could please guide me to make this solution. I want to know the safety precautions i need to take ...
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3answers
36k views

Does milk drinking prevent long-term chemical poisoning?

I have heard some rumors that drinking milk prevents chemical poisoning. I have done a bit research and some sources confirm that. Corrosive Poisons The best first aid is to dilute the poison ...
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1answer
129 views

Is there any explosion hazard with an enclosed graphite crucible melting silver?

the crucible volume is about 2 ounces. The final design of the crucible will be enclosed tightly except for a small .5mm diameter hole at the bottom and a 1mm diameter hole at the top through which ...
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2answers
635 views

What equipment to use to make liquid oxygen?

I'd like to do some experiments with liquid oxygen but as a first step I'll have to make some. Unfortunately I don't have any experience designing cryogenic experiments. I'm thinking I'll cool gaseous ...
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2answers
728 views

Does combustion occur more easily at higher oxygen concentrations or just higher oxygen partial pressure?

I saw a trailer for The Martian and started thinking about space flight. I know that spacecraft and spacesuits often operate at low pressure with high oxygen content (near 100% $\ce{O2}$ at about 20 ...
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2answers
14k views

How is it possible to dissolve zinc oxide safely for skin use, preferably without acid?

Zinc oxide comes as a powder that is insoluble in water but soluble in most acids. I once received a clear liquid containing zinc oxide from an Italian pharmacy as a deodorant. What could they have ...
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1answer
61 views

Why “RCA clean” solution has to be prepared every time (and not stored long-term)?

"RCA clean" solution is a 5:1:1 mixture of DI water, ammonium hydroxide and hydrogen peroxide. Why the ready 5:1:1 solution is not stored for long term, but instead has to be prepared each time ...
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1answer
2k views

Sulfur hexafluoride creation process and risks/safety

I would like to create sulfur hexafluoride and test floating things in it but I am a "chemistry noob" and from what I've read it's non-toxic and generally quite safe but first of all I do not know how ...
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1answer
30k views

why does milk of magnesia have an expiration date?

I noticed an old bottle of milk of magnesia in my refrigerator and saw that it had an expiration date printed: January 2015. Checking the ingredients, I saw only three: magnesium hydroxide, purified ...
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1answer
691 views

While filling liquid oxygen into a tank, why do they do open one end?

While filling liquid oxygen into a tank, why do they do open one end? Then what is use of filling? I don't think people who are filling this truck are beginners.
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1answer
1k views

Vacuum distillation apparatus selection and configuration

I want to assemble a "hobbyist-level" vacuum distillation apparatus for extracting small volumes of "typical" solvents (e.g., water, alcohols, ketones, diols). I already have standard lab glassware ...
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1answer
3k views

Is heating dilute HCl dangerous?

Say dilute $\ce{HCl}$ is used to convert some alkaloid to salt form, then the alkaloid is dried with heat, would gaseous $\ce{HCl}$ be released in the process? Is there a threshold concentration of ...
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3answers
8k views

Is liquid oxygen non flammable?

Every one knows that liquid oxygen is flammable, but why this tank labeled like this: so is it really liquid oxygen is non flammable?
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3answers
3k views

Lab safety - Long vs. Short Sleeves on Lab Coats

I have three lab coats, two with long sleeves, and one with short sleeves. I saw that the concepts about lab safety vary from country to country; in some places it looks like the short-sleeve coat ...
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2answers
534 views

Percent concentration of 500 μM of H2O2

What is the percent concentration of hydrogen peroxide which has a concentration of $500~\mu\mathrm{M}$? Is $500~\mu\mathrm{M}$ $\ce{H2O2}$ toxic to the eyes? A particular honey has a concentration ...
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2answers
13k views

What are the effects of Lithium Dioxide on the body?

My question is about how much science-fiction and how much chemistry is involved in the the 'Randy's Donuts' scene of Iron Man 2: Agent Romanoff injects Lithium Dioxide into Tony Stark's neck to ...
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4answers
1k views

Liquid nitrogen to cool liquid?

Is it possible and safe to use liquid nitrogen to quickly cool a 5 gallon tank of liquid from room teperature to say 34 °F? Or is there another way that can produce really fast results?
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1answer
123 views

How to control and vanish termiticide/pesticide fumes from room

I had some wood work done in my room and termiticide (UNIBAN-20 (Chlorpyriphos-20% EC) was used so that there is no termites attack in future. The stupid carpenter was using this product for the first ...
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0answers
579 views

What results from combining monopotassium phosphate, magnesium sulfate and calcium nitrate?

If I mix monopotassium phosphate, magnesium sulfate, and calcium nitrate together in aqueous solution, what chemicals will result? Are these safe to combine (i.e. any toxic gases, etc.)? I thought ...
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1answer
10k views

How do I store HCl safely?

I'm in a textile unit, where we use different chemicals. My question is what type of material should I make my tank out of to store my hydrochloric acid?
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1answer
159 views

Safety/health hazards: working with 2-aminobenzimidazole, iminoesters, and 1,3,5-triazine [closed]

How dangerous is it working with 2-aminobenzimidazole, iminoesters and 1,3,5-triazine? Has there been any cases of health problems recorded concerning those three compounds?
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1answer
140 views

Bromate forming in open water

According to this article, the city of Los Angeles (in the USA) is facing a problem where bromate, a suspected carcinogen, has been forming in their open water supplies. They believe that the ...
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5answers
58k views

Acid Accident Treatment

What are the general ways to treat an accident involving highly concentrated or similarly dangerous acids? I have a lab instructor who recently debated with our group about treating an acid spill on ...
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2answers
690 views

Lithium batteries a reality - why not sodium, pottasium batteries?

Lithium batteries seem to be mainstream now, offering high energy density, high output current capability. Stepping down the periodic table there are alkali metals with greater electronegativity than ...
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1answer
6k views

How to produce dry pure oxygen

I'm supposed to produce dry and pure oxygen using the decomposition of hydrogen peroxide with a manganese dioxide catalyst. $$\ce{2H2O2 (aq) → 2H2O (l) + O2 (g)}$$ The gas will be collected in a ...
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5answers
17k views

How to stop goggles from fogging?

I wear corrective eyeglasses, and because of this, I frequently experience problems with fogging when I wear safety goggles. How can I prevent or reduce fogging? The safety goggles I use are the ...
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1answer
3k views

Reaction between a vinegar/salt/hydrogen peroxide mixture as an etching solution and copper

I am looking for the less harmful chemical solution to serve as an etching solution. After many searches, my interest went to a vinegar/salt/hydrogen peroxide solution. I have to ask then if the ...

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